Find only GUIDs in file - Bash
I have a file that might contain GUIDs (their canonical textual representation).
I want to do an action for each GUID in the file. It might contain any number of GUIDs.
I have already a file ready for reading. How do I spot the GUIDS?
I know I need to use while read FILENAME
An example of my file :
GUIDs
--------------------------------------
cf6e328c-c918-4d2f-80d3-71ecaf09bf7b
91d523b0-4926-456e-a9d2-ade713f5b07f
(2 rows)
// THERE IS AN EMPTY LINE HERE AFTER NUMBER OF ROWS
bash shell-script scripting wildcards
edited 17 hours ago
Stéphane Chazelas
301k55564916
asked 18 hours ago
MathEnthusiastMathEnthusiast
233
New contributor
MathEnthusiast is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
|
show 2 more comments
I have a file that might contain GUIDs (their canonical textual representation).
I want to do an action for each GUID in the file. It might contain any number of GUIDs.
I have already a file ready for reading. How do I spot the GUIDS?
I know I need to use while read FILENAME
An example of my file :
GUIDs
--------------------------------------
cf6e328c-c918-4d2f-80d3-71ecaf09bf7b
91d523b0-4926-456e-a9d2-ade713f5b07f
(2 rows)
// THERE IS AN EMPTY LINE HERE AFTER NUMBER OF ROWS
bash shell-script scripting wildcards
edited 17 hours ago
Stéphane Chazelas
301k55564916
asked 18 hours ago
MathEnthusiastMathEnthusiast
233
New contributor
MathEnthusiast is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Post your sample file.
– Tuyen Pham
18 hours ago
You're looking for any digit(s) from 0 to 10k, in any format? Or what exactly
– Xen2050
17 hours ago
I wrote a file as example
– MathEnthusiast
17 hours ago
What's the action you want to perform? It alters the possible solution
– roaima
17 hours ago
I need to run a command and then wait 5 seconds
– MathEnthusiast
17 hours ago
|
show 2 more comments
I have a file that might contain GUIDs (their canonical textual representation).
I want to do an action for each GUID in the file. It might contain any number of GUIDs.
I have already a file ready for reading. How do I spot the GUIDS?
I know I need to use while read FILENAME
An example of my file :
GUIDs
--------------------------------------
cf6e328c-c918-4d2f-80d3-71ecaf09bf7b
91d523b0-4926-456e-a9d2-ade713f5b07f
(2 rows)
// THERE IS AN EMPTY LINE HERE AFTER NUMBER OF ROWS
bash shell-script scripting wildcards
edited 17 hours ago
Stéphane Chazelas
301k55564916
asked 18 hours ago
MathEnthusiastMathEnthusiast
233
New contributor
MathEnthusiast is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I have a file that might contain GUIDs (their canonical textual representation).
I want to do an action for each GUID in the file. It might contain any number of GUIDs.
I have already a file ready for reading. How do I spot the GUIDS?
I know I need to use while read FILENAME
An example of my file :
GUIDs
--------------------------------------
cf6e328c-c918-4d2f-80d3-71ecaf09bf7b
91d523b0-4926-456e-a9d2-ade713f5b07f
(2 rows)
// THERE IS AN EMPTY LINE HERE AFTER NUMBER OF ROWS
bash shell-script scripting wildcards
bash shell-script scripting wildcards
edited 17 hours ago
Stéphane Chazelas
301k55564916
asked 18 hours ago
MathEnthusiastMathEnthusiast
233
New contributor
MathEnthusiast is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 17 hours ago
Stéphane Chazelas
301k55564916
asked 18 hours ago
MathEnthusiastMathEnthusiast
233
New contributor
MathEnthusiast is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 17 hours ago
Stéphane Chazelas
301k55564916
edited 17 hours ago
Stéphane Chazelas
301k55564916
edited 17 hours ago
Stéphane Chazelas
301k55564916
301k55564916
asked 18 hours ago
MathEnthusiastMathEnthusiast
233
New contributor
MathEnthusiast is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 18 hours ago
MathEnthusiastMathEnthusiast
233
asked 18 hours ago
MathEnthusiastMathEnthusiast
233
233
New contributor
MathEnthusiast is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
MathEnthusiast is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
MathEnthusiast is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Post your sample file.
– Tuyen Pham
18 hours ago
You're looking for any digit(s) from 0 to 10k, in any format? Or what exactly
– Xen2050
17 hours ago
I wrote a file as example
– MathEnthusiast
17 hours ago
What's the action you want to perform? It alters the possible solution
– roaima
17 hours ago
I need to run a command and then wait 5 seconds
– MathEnthusiast
17 hours ago
|
show 2 more comments
Post your sample file.
– Tuyen Pham
18 hours ago
You're looking for any digit(s) from 0 to 10k, in any format? Or what exactly
– Xen2050
17 hours ago
I wrote a file as example
– MathEnthusiast
17 hours ago
What's the action you want to perform? It alters the possible solution
– roaima
17 hours ago
I need to run a command and then wait 5 seconds
– MathEnthusiast
17 hours ago
Post your sample file.
– Tuyen Pham
18 hours ago
Post your sample file.
– Tuyen Pham
18 hours ago
You're looking for any digit(s) from 0 to 10k, in any format? Or what exactly
– Xen2050
17 hours ago
You're looking for any digit(s) from 0 to 10k, in any format? Or what exactly
– Xen2050
17 hours ago
I wrote a file as example
– MathEnthusiast
17 hours ago
I wrote a file as example
– MathEnthusiast
17 hours ago
What's the action you want to perform? It alters the possible solution
– roaima
17 hours ago
What's the action you want to perform? It alters the possible solution
– roaima
17 hours ago
I need to run a command and then wait 5 seconds
– MathEnthusiast
17 hours ago
I need to run a command and then wait 5 seconds
– MathEnthusiast
17 hours ago
|
show 2 more comments
2 Answers
2
active
oldest
votes
With the GNU implementation of grep (or compatible):
<your-file grep -Ewo '[[:xdigit:]]{8}(-[[:xdigit:]]{4}){3}-[[:xdigit:]]{12}' |
while IFS= read -r guid; do
your-action "$guid"
sleep 5
done
Would find those GUIDs wherever they are in the input (and provided they are neither preceded nor followed by word characters).
GNU grep has a -o option that prints the non-empty matches of the regular expression.
-w is another non-standard extension coming I believe from SysV to match on whole words only. It matches only if the matched text is between a transition between a non-word and word character and one between a word and non-word character (where word characters are alphanumerics or underscore). That's to guard against matching on things like:
aaaaaaaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaaaaaaaaaaa
The rest is standard POSIX syntax. Note that [[:xdigit:]] matches on ABCDEF as well. You can replace it with [0123456789abcdef] if you want to match only lower case GUIDs.
answered 17 hours ago
Stéphane ChazelasStéphane Chazelas
301k55564916
Can you please explain? What is that "<" in the beginning ? Also - what is GNU tools ? Can we assume my file name is GUIDS.TXT ?
– MathEnthusiast
17 hours ago
Also - what is GNU tools ?
– MathEnthusiast
17 hours ago
@MathEnthusiast, see edit. The GNU project is an effort by the Free Software Foundation to provide with a FLOSS reimplementation of Unix. Some people confuse it with Linux as GNU systems generally use Linux as their kernel. They have written extended versions of the Unix utilities (likegrephere) which support extensions like that-oand<(<was in SysVgrepbefore GNU's). GNU utilities are now more common than the original versions, and many other non-GNU implementations have copied some of the GNU extensions. In particular,-ois found in many other implementations.
– Stéphane Chazelas
17 hours ago
@StéphaneChazelas, how do you guard against matchingcf6e328c-c918-4d2f-80d3-71ecaf09bf7b-91d523b0-4926-456e-a9d2-ade713f5b07f? (i.e. some non-guid thing that looks like two guids joined by a hyphen)
– Noach
15 hours ago
@StéphaneChazelas: What edge-case are you guarding for with theIFS= read -rvs. a simpleread?
– Noach
15 hours ago
|
show 2 more comments
While I love Regular Expressions, I prefer to avoid over-specifying.
For this particular data set (known data format, one GUI per line, plus header and footer), I'd just strip out the header/footers:
$ cat guids.txt | egrep -v 'GUIDs|--|rows|^$' |
while read guid ; do
some_command "$guid"
sleep 5
done
Alternatively, I'd grep out the lines I want, but also keep the regexp as simple as possible for the current data set:
egrep '^[0-9a-f-]{36}$'
answered 15 hours ago
NoachNoach
1904
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
With the GNU implementation of grep (or compatible):
<your-file grep -Ewo '[[:xdigit:]]{8}(-[[:xdigit:]]{4}){3}-[[:xdigit:]]{12}' |
while IFS= read -r guid; do
your-action "$guid"
sleep 5
done
Would find those GUIDs wherever they are in the input (and provided they are neither preceded nor followed by word characters).
GNU grep has a -o option that prints the non-empty matches of the regular expression.
-w is another non-standard extension coming I believe from SysV to match on whole words only. It matches only if the matched text is between a transition between a non-word and word character and one between a word and non-word character (where word characters are alphanumerics or underscore). That's to guard against matching on things like:
aaaaaaaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaaaaaaaaaaa
The rest is standard POSIX syntax. Note that [[:xdigit:]] matches on ABCDEF as well. You can replace it with [0123456789abcdef] if you want to match only lower case GUIDs.
answered 17 hours ago
Stéphane ChazelasStéphane Chazelas
301k55564916
Can you please explain? What is that "<" in the beginning ? Also - what is GNU tools ? Can we assume my file name is GUIDS.TXT ?
– MathEnthusiast
17 hours ago
Also - what is GNU tools ?
– MathEnthusiast
17 hours ago
@MathEnthusiast, see edit. The GNU project is an effort by the Free Software Foundation to provide with a FLOSS reimplementation of Unix. Some people confuse it with Linux as GNU systems generally use Linux as their kernel. They have written extended versions of the Unix utilities (likegrephere) which support extensions like that-oand<(<was in SysVgrepbefore GNU's). GNU utilities are now more common than the original versions, and many other non-GNU implementations have copied some of the GNU extensions. In particular,-ois found in many other implementations.
– Stéphane Chazelas
17 hours ago
@StéphaneChazelas, how do you guard against matchingcf6e328c-c918-4d2f-80d3-71ecaf09bf7b-91d523b0-4926-456e-a9d2-ade713f5b07f? (i.e. some non-guid thing that looks like two guids joined by a hyphen)
– Noach
15 hours ago
@StéphaneChazelas: What edge-case are you guarding for with theIFS= read -rvs. a simpleread?
– Noach
15 hours ago
|
show 2 more comments
With the GNU implementation of grep (or compatible):
<your-file grep -Ewo '[[:xdigit:]]{8}(-[[:xdigit:]]{4}){3}-[[:xdigit:]]{12}' |
while IFS= read -r guid; do
your-action "$guid"
sleep 5
done
Would find those GUIDs wherever they are in the input (and provided they are neither preceded nor followed by word characters).
GNU grep has a -o option that prints the non-empty matches of the regular expression.
-w is another non-standard extension coming I believe from SysV to match on whole words only. It matches only if the matched text is between a transition between a non-word and word character and one between a word and non-word character (where word characters are alphanumerics or underscore). That's to guard against matching on things like:
aaaaaaaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaaaaaaaaaaa
The rest is standard POSIX syntax. Note that [[:xdigit:]] matches on ABCDEF as well. You can replace it with [0123456789abcdef] if you want to match only lower case GUIDs.
answered 17 hours ago
Stéphane ChazelasStéphane Chazelas
301k55564916
Can you please explain? What is that "<" in the beginning ? Also - what is GNU tools ? Can we assume my file name is GUIDS.TXT ?
– MathEnthusiast
17 hours ago
Also - what is GNU tools ?
– MathEnthusiast
17 hours ago
@MathEnthusiast, see edit. The GNU project is an effort by the Free Software Foundation to provide with a FLOSS reimplementation of Unix. Some people confuse it with Linux as GNU systems generally use Linux as their kernel. They have written extended versions of the Unix utilities (likegrephere) which support extensions like that-oand<(<was in SysVgrepbefore GNU's). GNU utilities are now more common than the original versions, and many other non-GNU implementations have copied some of the GNU extensions. In particular,-ois found in many other implementations.
– Stéphane Chazelas
17 hours ago
@StéphaneChazelas, how do you guard against matchingcf6e328c-c918-4d2f-80d3-71ecaf09bf7b-91d523b0-4926-456e-a9d2-ade713f5b07f? (i.e. some non-guid thing that looks like two guids joined by a hyphen)
– Noach
15 hours ago
@StéphaneChazelas: What edge-case are you guarding for with theIFS= read -rvs. a simpleread?
– Noach
15 hours ago
|
show 2 more comments
With the GNU implementation of grep (or compatible):
<your-file grep -Ewo '[[:xdigit:]]{8}(-[[:xdigit:]]{4}){3}-[[:xdigit:]]{12}' |
while IFS= read -r guid; do
your-action "$guid"
sleep 5
done
Would find those GUIDs wherever they are in the input (and provided they are neither preceded nor followed by word characters).
GNU grep has a -o option that prints the non-empty matches of the regular expression.
-w is another non-standard extension coming I believe from SysV to match on whole words only. It matches only if the matched text is between a transition between a non-word and word character and one between a word and non-word character (where word characters are alphanumerics or underscore). That's to guard against matching on things like:
aaaaaaaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaaaaaaaaaaa
The rest is standard POSIX syntax. Note that [[:xdigit:]] matches on ABCDEF as well. You can replace it with [0123456789abcdef] if you want to match only lower case GUIDs.
answered 17 hours ago
Stéphane ChazelasStéphane Chazelas
301k55564916
With the GNU implementation of grep (or compatible):
<your-file grep -Ewo '[[:xdigit:]]{8}(-[[:xdigit:]]{4}){3}-[[:xdigit:]]{12}' |
while IFS= read -r guid; do
your-action "$guid"
sleep 5
done
Would find those GUIDs wherever they are in the input (and provided they are neither preceded nor followed by word characters).
GNU grep has a -o option that prints the non-empty matches of the regular expression.
-w is another non-standard extension coming I believe from SysV to match on whole words only. It matches only if the matched text is between a transition between a non-word and word character and one between a word and non-word character (where word characters are alphanumerics or underscore). That's to guard against matching on things like:
aaaaaaaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaaaaaaaaaaa
The rest is standard POSIX syntax. Note that [[:xdigit:]] matches on ABCDEF as well. You can replace it with [0123456789abcdef] if you want to match only lower case GUIDs.
answered 17 hours ago
Stéphane ChazelasStéphane Chazelas
301k55564916
edited 14 hours ago
answered 17 hours ago
Stéphane ChazelasStéphane Chazelas
301k55564916
answered 17 hours ago
Stéphane ChazelasStéphane Chazelas
301k55564916
answered 17 hours ago
Stéphane ChazelasStéphane Chazelas
301k55564916
301k55564916
Can you please explain? What is that "<" in the beginning ? Also - what is GNU tools ? Can we assume my file name is GUIDS.TXT ?
– MathEnthusiast
17 hours ago
Also - what is GNU tools ?
– MathEnthusiast
17 hours ago
@MathEnthusiast, see edit. The GNU project is an effort by the Free Software Foundation to provide with a FLOSS reimplementation of Unix. Some people confuse it with Linux as GNU systems generally use Linux as their kernel. They have written extended versions of the Unix utilities (likegrephere) which support extensions like that-oand<(<was in SysVgrepbefore GNU's). GNU utilities are now more common than the original versions, and many other non-GNU implementations have copied some of the GNU extensions. In particular,-ois found in many other implementations.
– Stéphane Chazelas
17 hours ago
@StéphaneChazelas, how do you guard against matchingcf6e328c-c918-4d2f-80d3-71ecaf09bf7b-91d523b0-4926-456e-a9d2-ade713f5b07f? (i.e. some non-guid thing that looks like two guids joined by a hyphen)
– Noach
15 hours ago
@StéphaneChazelas: What edge-case are you guarding for with theIFS= read -rvs. a simpleread?
– Noach
15 hours ago
|
show 2 more comments
Can you please explain? What is that "<" in the beginning ? Also - what is GNU tools ? Can we assume my file name is GUIDS.TXT ?
– MathEnthusiast
17 hours ago
Also - what is GNU tools ?
– MathEnthusiast
17 hours ago
@MathEnthusiast, see edit. The GNU project is an effort by the Free Software Foundation to provide with a FLOSS reimplementation of Unix. Some people confuse it with Linux as GNU systems generally use Linux as their kernel. They have written extended versions of the Unix utilities (likegrephere) which support extensions like that-oand<(<was in SysVgrepbefore GNU's). GNU utilities are now more common than the original versions, and many other non-GNU implementations have copied some of the GNU extensions. In particular,-ois found in many other implementations.
– Stéphane Chazelas
17 hours ago
@StéphaneChazelas, how do you guard against matchingcf6e328c-c918-4d2f-80d3-71ecaf09bf7b-91d523b0-4926-456e-a9d2-ade713f5b07f? (i.e. some non-guid thing that looks like two guids joined by a hyphen)
– Noach
15 hours ago
@StéphaneChazelas: What edge-case are you guarding for with theIFS= read -rvs. a simpleread?
– Noach
15 hours ago
Can you please explain? What is that "<" in the beginning ? Also - what is GNU tools ? Can we assume my file name is GUIDS.TXT ?
– MathEnthusiast
17 hours ago
Can you please explain? What is that "<" in the beginning ? Also - what is GNU tools ? Can we assume my file name is GUIDS.TXT ?
– MathEnthusiast
17 hours ago
Also - what is GNU tools ?
– MathEnthusiast
17 hours ago
Also - what is GNU tools ?
– MathEnthusiast
17 hours ago
@MathEnthusiast, see edit. The GNU project is an effort by the Free Software Foundation to provide with a FLOSS reimplementation of Unix. Some people confuse it with Linux as GNU systems generally use Linux as their kernel. They have written extended versions of the Unix utilities (like
grep here) which support extensions like that -o and < (< was in SysV grep before GNU's). GNU utilities are now more common than the original versions, and many other non-GNU implementations have copied some of the GNU extensions. In particular, -o is found in many other implementations.– Stéphane Chazelas
17 hours ago
@MathEnthusiast, see edit. The GNU project is an effort by the Free Software Foundation to provide with a FLOSS reimplementation of Unix. Some people confuse it with Linux as GNU systems generally use Linux as their kernel. They have written extended versions of the Unix utilities (like
grep here) which support extensions like that -o and < (< was in SysV grep before GNU's). GNU utilities are now more common than the original versions, and many other non-GNU implementations have copied some of the GNU extensions. In particular, -o is found in many other implementations.– Stéphane Chazelas
17 hours ago
@StéphaneChazelas, how do you guard against matching
cf6e328c-c918-4d2f-80d3-71ecaf09bf7b-91d523b0-4926-456e-a9d2-ade713f5b07f? (i.e. some non-guid thing that looks like two guids joined by a hyphen)– Noach
15 hours ago
@StéphaneChazelas, how do you guard against matching
cf6e328c-c918-4d2f-80d3-71ecaf09bf7b-91d523b0-4926-456e-a9d2-ade713f5b07f? (i.e. some non-guid thing that looks like two guids joined by a hyphen)– Noach
15 hours ago
@StéphaneChazelas: What edge-case are you guarding for with the
IFS= read -r vs. a simple read?– Noach
15 hours ago
@StéphaneChazelas: What edge-case are you guarding for with the
IFS= read -r vs. a simple read?– Noach
15 hours ago
|
show 2 more comments
While I love Regular Expressions, I prefer to avoid over-specifying.
For this particular data set (known data format, one GUI per line, plus header and footer), I'd just strip out the header/footers:
$ cat guids.txt | egrep -v 'GUIDs|--|rows|^$' |
while read guid ; do
some_command "$guid"
sleep 5
done
Alternatively, I'd grep out the lines I want, but also keep the regexp as simple as possible for the current data set:
egrep '^[0-9a-f-]{36}$'
answered 15 hours ago
NoachNoach
1904
add a comment |
While I love Regular Expressions, I prefer to avoid over-specifying.
For this particular data set (known data format, one GUI per line, plus header and footer), I'd just strip out the header/footers:
$ cat guids.txt | egrep -v 'GUIDs|--|rows|^$' |
while read guid ; do
some_command "$guid"
sleep 5
done
Alternatively, I'd grep out the lines I want, but also keep the regexp as simple as possible for the current data set:
egrep '^[0-9a-f-]{36}$'
answered 15 hours ago
NoachNoach
1904
add a comment |
While I love Regular Expressions, I prefer to avoid over-specifying.
For this particular data set (known data format, one GUI per line, plus header and footer), I'd just strip out the header/footers:
$ cat guids.txt | egrep -v 'GUIDs|--|rows|^$' |
while read guid ; do
some_command "$guid"
sleep 5
done
Alternatively, I'd grep out the lines I want, but also keep the regexp as simple as possible for the current data set:
egrep '^[0-9a-f-]{36}$'
answered 15 hours ago
NoachNoach
1904
While I love Regular Expressions, I prefer to avoid over-specifying.
For this particular data set (known data format, one GUI per line, plus header and footer), I'd just strip out the header/footers:
$ cat guids.txt | egrep -v 'GUIDs|--|rows|^$' |
while read guid ; do
some_command "$guid"
sleep 5
done
Alternatively, I'd grep out the lines I want, but also keep the regexp as simple as possible for the current data set:
egrep '^[0-9a-f-]{36}$'
answered 15 hours ago
NoachNoach
1904
edited 15 hours ago
answered 15 hours ago
NoachNoach
1904
answered 15 hours ago
NoachNoach
1904
answered 15 hours ago
NoachNoach
1904
1904
add a comment |
add a comment |
MathEnthusiast is a new contributor. Be nice, and check out our Code of Conduct.
MathEnthusiast is a new contributor. Be nice, and check out our Code of Conduct.
MathEnthusiast is a new contributor. Be nice, and check out our Code of Conduct.
MathEnthusiast is a new contributor. Be nice, and check out our Code of Conduct.
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Post your sample file.
– Tuyen Pham
18 hours ago
You're looking for any digit(s) from 0 to 10k, in any format? Or what exactly
– Xen2050
17 hours ago
I wrote a file as example
– MathEnthusiast
17 hours ago
What's the action you want to perform? It alters the possible solution
– roaima
17 hours ago
I need to run a command and then wait 5 seconds
– MathEnthusiast
17 hours ago