Check if a give port is included in output, if it is run another command
I have a commandb:
printf '%s' "${PORTS[0]}"; printf ',%s' "${PORTS[@]:1}"
That lists ports from another command that output of commandb looks like:
2200,800,8000
These ports are stored in a file name res.txt
I want to check if commandb has a specific port of 8000, if it does, I want to run a commandc, otherwise do nothing.
How can I achieve this in bash?
bash
asked Dec 20 '18 at 16:45
john jones
1124
add a comment |
I have a commandb:
printf '%s' "${PORTS[0]}"; printf ',%s' "${PORTS[@]:1}"
That lists ports from another command that output of commandb looks like:
2200,800,8000
These ports are stored in a file name res.txt
I want to check if commandb has a specific port of 8000, if it does, I want to run a commandc, otherwise do nothing.
How can I achieve this in bash?
bash
asked Dec 20 '18 at 16:45
john jones
1124
add a comment |
I have a commandb:
printf '%s' "${PORTS[0]}"; printf ',%s' "${PORTS[@]:1}"
That lists ports from another command that output of commandb looks like:
2200,800,8000
These ports are stored in a file name res.txt
I want to check if commandb has a specific port of 8000, if it does, I want to run a commandc, otherwise do nothing.
How can I achieve this in bash?
bash
asked Dec 20 '18 at 16:45
john jones
1124
I have a commandb:
printf '%s' "${PORTS[0]}"; printf ',%s' "${PORTS[@]:1}"
That lists ports from another command that output of commandb looks like:
2200,800,8000
These ports are stored in a file name res.txt
I want to check if commandb has a specific port of 8000, if it does, I want to run a commandc, otherwise do nothing.
How can I achieve this in bash?
bash
bash
asked Dec 20 '18 at 16:45
john jones
1124
asked Dec 20 '18 at 16:45
john jones
1124
asked Dec 20 '18 at 16:45
john jones
1124
asked Dec 20 '18 at 16:45
john jones
1124
asked Dec 20 '18 at 16:45
john jones
1124
1124
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
You can use grep -w to specify a word boundary:
$ grep -qw '8000' res.txt && echo 'hello world'
hello world
The -q option just prevents grep from printing the results so you can simply act on the exit code. Without the -w option you would get a successful result from 80 as it is contained within 800 and 8000:
$ grep -q '80' res.txt && echo 'hello world'; echo $?
hello world
0
$ grep -qw '80' res.txt && echo 'hello world'; echo $?
1
In order to check for the existence of multiple ports you can do the following:
if grep -qw -e '8000' -e '80' res.txt; then
do something
fi
answered Dec 20 '18 at 16:55
Jesse_b
11.9k23064
can you check for multiple ports like 80 and 8080 with -qw '80' || '8080' ?
– john jones
Dec 20 '18 at 17:02
Do you want to know if both exist or if one or the other exists?
– Jesse_b
Dec 20 '18 at 17:02
one or other please.
– john jones
Dec 20 '18 at 17:03
@johnjones: Does my update help?
– Jesse_b
Dec 20 '18 at 17:23
1
you should be able to givegrepmultiple patterns to match against, e.g.echo '123,456,789' | grep -w -e 123 -e 111should report a match and print the line
– ilkkachu
Dec 20 '18 at 17:28
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
You can use grep -w to specify a word boundary:
$ grep -qw '8000' res.txt && echo 'hello world'
hello world
The -q option just prevents grep from printing the results so you can simply act on the exit code. Without the -w option you would get a successful result from 80 as it is contained within 800 and 8000:
$ grep -q '80' res.txt && echo 'hello world'; echo $?
hello world
0
$ grep -qw '80' res.txt && echo 'hello world'; echo $?
1
In order to check for the existence of multiple ports you can do the following:
if grep -qw -e '8000' -e '80' res.txt; then
do something
fi
answered Dec 20 '18 at 16:55
Jesse_b
11.9k23064
can you check for multiple ports like 80 and 8080 with -qw '80' || '8080' ?
– john jones
Dec 20 '18 at 17:02
Do you want to know if both exist or if one or the other exists?
– Jesse_b
Dec 20 '18 at 17:02
one or other please.
– john jones
Dec 20 '18 at 17:03
@johnjones: Does my update help?
– Jesse_b
Dec 20 '18 at 17:23
1
you should be able to givegrepmultiple patterns to match against, e.g.echo '123,456,789' | grep -w -e 123 -e 111should report a match and print the line
– ilkkachu
Dec 20 '18 at 17:28
add a comment |
You can use grep -w to specify a word boundary:
$ grep -qw '8000' res.txt && echo 'hello world'
hello world
The -q option just prevents grep from printing the results so you can simply act on the exit code. Without the -w option you would get a successful result from 80 as it is contained within 800 and 8000:
$ grep -q '80' res.txt && echo 'hello world'; echo $?
hello world
0
$ grep -qw '80' res.txt && echo 'hello world'; echo $?
1
In order to check for the existence of multiple ports you can do the following:
if grep -qw -e '8000' -e '80' res.txt; then
do something
fi
answered Dec 20 '18 at 16:55
Jesse_b
11.9k23064
can you check for multiple ports like 80 and 8080 with -qw '80' || '8080' ?
– john jones
Dec 20 '18 at 17:02
Do you want to know if both exist or if one or the other exists?
– Jesse_b
Dec 20 '18 at 17:02
one or other please.
– john jones
Dec 20 '18 at 17:03
@johnjones: Does my update help?
– Jesse_b
Dec 20 '18 at 17:23
1
you should be able to givegrepmultiple patterns to match against, e.g.echo '123,456,789' | grep -w -e 123 -e 111should report a match and print the line
– ilkkachu
Dec 20 '18 at 17:28
add a comment |
You can use grep -w to specify a word boundary:
$ grep -qw '8000' res.txt && echo 'hello world'
hello world
The -q option just prevents grep from printing the results so you can simply act on the exit code. Without the -w option you would get a successful result from 80 as it is contained within 800 and 8000:
$ grep -q '80' res.txt && echo 'hello world'; echo $?
hello world
0
$ grep -qw '80' res.txt && echo 'hello world'; echo $?
1
In order to check for the existence of multiple ports you can do the following:
if grep -qw -e '8000' -e '80' res.txt; then
do something
fi
answered Dec 20 '18 at 16:55
Jesse_b
11.9k23064
You can use grep -w to specify a word boundary:
$ grep -qw '8000' res.txt && echo 'hello world'
hello world
The -q option just prevents grep from printing the results so you can simply act on the exit code. Without the -w option you would get a successful result from 80 as it is contained within 800 and 8000:
$ grep -q '80' res.txt && echo 'hello world'; echo $?
hello world
0
$ grep -qw '80' res.txt && echo 'hello world'; echo $?
1
In order to check for the existence of multiple ports you can do the following:
if grep -qw -e '8000' -e '80' res.txt; then
do something
fi
answered Dec 20 '18 at 16:55
Jesse_b
11.9k23064
edited Dec 20 '18 at 17:32
answered Dec 20 '18 at 16:55
Jesse_b
11.9k23064
answered Dec 20 '18 at 16:55
Jesse_b
11.9k23064
answered Dec 20 '18 at 16:55
Jesse_b
11.9k23064
11.9k23064
can you check for multiple ports like 80 and 8080 with -qw '80' || '8080' ?
– john jones
Dec 20 '18 at 17:02
Do you want to know if both exist or if one or the other exists?
– Jesse_b
Dec 20 '18 at 17:02
one or other please.
– john jones
Dec 20 '18 at 17:03
@johnjones: Does my update help?
– Jesse_b
Dec 20 '18 at 17:23
1
you should be able to givegrepmultiple patterns to match against, e.g.echo '123,456,789' | grep -w -e 123 -e 111should report a match and print the line
– ilkkachu
Dec 20 '18 at 17:28
add a comment |
can you check for multiple ports like 80 and 8080 with -qw '80' || '8080' ?
– john jones
Dec 20 '18 at 17:02
Do you want to know if both exist or if one or the other exists?
– Jesse_b
Dec 20 '18 at 17:02
one or other please.
– john jones
Dec 20 '18 at 17:03
@johnjones: Does my update help?
– Jesse_b
Dec 20 '18 at 17:23
1
you should be able to givegrepmultiple patterns to match against, e.g.echo '123,456,789' | grep -w -e 123 -e 111should report a match and print the line
– ilkkachu
Dec 20 '18 at 17:28
can you check for multiple ports like 80 and 8080 with -qw '80' || '8080' ?
– john jones
Dec 20 '18 at 17:02
can you check for multiple ports like 80 and 8080 with -qw '80' || '8080' ?
– john jones
Dec 20 '18 at 17:02
Do you want to know if both exist or if one or the other exists?
– Jesse_b
Dec 20 '18 at 17:02
Do you want to know if both exist or if one or the other exists?
– Jesse_b
Dec 20 '18 at 17:02
one or other please.
– john jones
Dec 20 '18 at 17:03
one or other please.
– john jones
Dec 20 '18 at 17:03
@johnjones: Does my update help?
– Jesse_b
Dec 20 '18 at 17:23
@johnjones: Does my update help?
– Jesse_b
Dec 20 '18 at 17:23
1
1
you should be able to give
grep multiple patterns to match against, e.g. echo '123,456,789' | grep -w -e 123 -e 111 should report a match and print the line– ilkkachu
Dec 20 '18 at 17:28
you should be able to give
grep multiple patterns to match against, e.g. echo '123,456,789' | grep -w -e 123 -e 111 should report a match and print the line– ilkkachu
Dec 20 '18 at 17:28
add a comment |
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