How to use regular expression result into another expression
I have two regular expressions i.e. command1 and command2 where i need to combine both expressions into a single expression using | for that command1 output should be passed to next expression.
command1:
grep 0x017a /sys/bus/pci/devices/*/device | cut -d/ -f6
>> Output : 00:00:01
command 2:
head -n1 /sys/bus/pci/devices/00:00:01/resource | cut -d ' ' -f 1 | tail -c 9
Can you please let me how to use command1 output (00:00:01) into command2 and combine into a single expression.
shell command-line command-substitution
edited Feb 12 at 10:41
jimmij
31.9k874108
asked Feb 12 at 0:55
Seshagiri LekkalaSeshagiri Lekkala
154
add a comment |
I have two regular expressions i.e. command1 and command2 where i need to combine both expressions into a single expression using | for that command1 output should be passed to next expression.
command1:
grep 0x017a /sys/bus/pci/devices/*/device | cut -d/ -f6
>> Output : 00:00:01
command 2:
head -n1 /sys/bus/pci/devices/00:00:01/resource | cut -d ' ' -f 1 | tail -c 9
Can you please let me how to use command1 output (00:00:01) into command2 and combine into a single expression.
shell command-line command-substitution
edited Feb 12 at 10:41
jimmij
31.9k874108
asked Feb 12 at 0:55
Seshagiri LekkalaSeshagiri Lekkala
154
Doeshead -n1 /sys/bus/pci/devices/`grep 0x017a /sys/bus/pci/devices/*/device | cut -d/ -f6`/resource | cut -d ' ' -f 1 | tail -c 9work?
– Hagen von Eitzen
Feb 12 at 1:01
I have tried but didn't work this way.
– Seshagiri Lekkala
Feb 12 at 1:09
what does command 2 return, what is the desired output?
– Evan Carroll
Feb 12 at 1:59
"head -n1 /sys/bus/pci/devices/00:00:01/resource | cut -d ' ' -f 1 | tail -c 9 " output is : da00000.
– Seshagiri Lekkala
Feb 12 at 2:03
Here, 00:00:01 is command 1 output.
– Seshagiri Lekkala
Feb 12 at 2:04
add a comment |
I have two regular expressions i.e. command1 and command2 where i need to combine both expressions into a single expression using | for that command1 output should be passed to next expression.
command1:
grep 0x017a /sys/bus/pci/devices/*/device | cut -d/ -f6
>> Output : 00:00:01
command 2:
head -n1 /sys/bus/pci/devices/00:00:01/resource | cut -d ' ' -f 1 | tail -c 9
Can you please let me how to use command1 output (00:00:01) into command2 and combine into a single expression.
shell command-line command-substitution
edited Feb 12 at 10:41
jimmij
31.9k874108
asked Feb 12 at 0:55
Seshagiri LekkalaSeshagiri Lekkala
154
I have two regular expressions i.e. command1 and command2 where i need to combine both expressions into a single expression using | for that command1 output should be passed to next expression.
command1:
grep 0x017a /sys/bus/pci/devices/*/device | cut -d/ -f6
>> Output : 00:00:01
command 2:
head -n1 /sys/bus/pci/devices/00:00:01/resource | cut -d ' ' -f 1 | tail -c 9
Can you please let me how to use command1 output (00:00:01) into command2 and combine into a single expression.
shell command-line command-substitution
shell command-line command-substitution
edited Feb 12 at 10:41
jimmij
31.9k874108
asked Feb 12 at 0:55
Seshagiri LekkalaSeshagiri Lekkala
154
edited Feb 12 at 10:41
jimmij
31.9k874108
asked Feb 12 at 0:55
Seshagiri LekkalaSeshagiri Lekkala
154
edited Feb 12 at 10:41
jimmij
31.9k874108
edited Feb 12 at 10:41
jimmij
31.9k874108
edited Feb 12 at 10:41
jimmij
31.9k874108
31.9k874108
asked Feb 12 at 0:55
Seshagiri LekkalaSeshagiri Lekkala
154
asked Feb 12 at 0:55
Seshagiri LekkalaSeshagiri Lekkala
154
asked Feb 12 at 0:55
Seshagiri LekkalaSeshagiri Lekkala
154
154
Doeshead -n1 /sys/bus/pci/devices/`grep 0x017a /sys/bus/pci/devices/*/device | cut -d/ -f6`/resource | cut -d ' ' -f 1 | tail -c 9work?
– Hagen von Eitzen
Feb 12 at 1:01
I have tried but didn't work this way.
– Seshagiri Lekkala
Feb 12 at 1:09
what does command 2 return, what is the desired output?
– Evan Carroll
Feb 12 at 1:59
"head -n1 /sys/bus/pci/devices/00:00:01/resource | cut -d ' ' -f 1 | tail -c 9 " output is : da00000.
– Seshagiri Lekkala
Feb 12 at 2:03
Here, 00:00:01 is command 1 output.
– Seshagiri Lekkala
Feb 12 at 2:04
add a comment |
Doeshead -n1 /sys/bus/pci/devices/`grep 0x017a /sys/bus/pci/devices/*/device | cut -d/ -f6`/resource | cut -d ' ' -f 1 | tail -c 9work?
– Hagen von Eitzen
Feb 12 at 1:01
I have tried but didn't work this way.
– Seshagiri Lekkala
Feb 12 at 1:09
what does command 2 return, what is the desired output?
– Evan Carroll
Feb 12 at 1:59
"head -n1 /sys/bus/pci/devices/00:00:01/resource | cut -d ' ' -f 1 | tail -c 9 " output is : da00000.
– Seshagiri Lekkala
Feb 12 at 2:03
Here, 00:00:01 is command 1 output.
– Seshagiri Lekkala
Feb 12 at 2:04
Does
head -n1 /sys/bus/pci/devices/`grep 0x017a /sys/bus/pci/devices/*/device | cut -d/ -f6`/resource | cut -d ' ' -f 1 | tail -c 9 work?– Hagen von Eitzen
Feb 12 at 1:01
Does
head -n1 /sys/bus/pci/devices/`grep 0x017a /sys/bus/pci/devices/*/device | cut -d/ -f6`/resource | cut -d ' ' -f 1 | tail -c 9 work?– Hagen von Eitzen
Feb 12 at 1:01
I have tried but didn't work this way.
– Seshagiri Lekkala
Feb 12 at 1:09
I have tried but didn't work this way.
– Seshagiri Lekkala
Feb 12 at 1:09
what does command 2 return, what is the desired output?
– Evan Carroll
Feb 12 at 1:59
what does command 2 return, what is the desired output?
– Evan Carroll
Feb 12 at 1:59
"head -n1 /sys/bus/pci/devices/00:00:01/resource | cut -d ' ' -f 1 | tail -c 9 " output is : da00000.
– Seshagiri Lekkala
Feb 12 at 2:03
"head -n1 /sys/bus/pci/devices/00:00:01/resource | cut -d ' ' -f 1 | tail -c 9 " output is : da00000.
– Seshagiri Lekkala
Feb 12 at 2:03
Here, 00:00:01 is command 1 output.
– Seshagiri Lekkala
Feb 12 at 2:04
Here, 00:00:01 is command 1 output.
– Seshagiri Lekkala
Feb 12 at 2:04
add a comment |
2 Answers
2
active
oldest
votes
To use the output of one command as argument of the second command the mechanism of command substitution $() can be utilized. For example:
Instead of
$ whoami
jimmij
$ ls /home/jimmij/tmp
file1 file2
you can do
$ ls /home/"$(whoami)"/tmp
file file2
In your specific case the single command become
head -n1 "/sys/bus/pci/devices/$(grep 0x017a /sys/bus/pci/devices/*/device | cut -d/ -f6)/resource" | cut -d ' ' -f 1 | tail -c 9
Notice I also quoted the entire expression, read here why you should do that.
answered Feb 12 at 10:40
jimmijjimmij
31.9k874108
add a comment |
Use the $(command) syntax (or the older `command` syntax).
DEVICE=$(grep 0x017a /sys/bus/pci/devices/*/device | cut -d/ -f6)
head -n1 "/sys/bus/pci/devices/$DEVICE/resource" | cut -d ' ' -f 1 | tail -c 9
Oh. "Combine into a single expression" similarly.
DEVICE=$(grep 0x017a /sys/bus/pci/devices/*/device | cut -d/ -f6)
OUTPUT=$(head -n1 "/sys/bus/pci/devices/$DEVICE/resource" | cut -d ' ' -f 1 | tail -c 9)
echo "Output is $OUTPUT"
answered Feb 12 at 1:46
Ken JacksonKen Jackson
1063
May i know how can we combine both line into single line ?
– Seshagiri Lekkala
Feb 12 at 1:57
Get out of the habit of using ALLCAPS varnames: one day you'll usePATH=...and then wonder why your script is broken.
– glenn jackman
Feb 12 at 15:05
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
To use the output of one command as argument of the second command the mechanism of command substitution $() can be utilized. For example:
Instead of
$ whoami
jimmij
$ ls /home/jimmij/tmp
file1 file2
you can do
$ ls /home/"$(whoami)"/tmp
file file2
In your specific case the single command become
head -n1 "/sys/bus/pci/devices/$(grep 0x017a /sys/bus/pci/devices/*/device | cut -d/ -f6)/resource" | cut -d ' ' -f 1 | tail -c 9
Notice I also quoted the entire expression, read here why you should do that.
answered Feb 12 at 10:40
jimmijjimmij
31.9k874108
add a comment |
To use the output of one command as argument of the second command the mechanism of command substitution $() can be utilized. For example:
Instead of
$ whoami
jimmij
$ ls /home/jimmij/tmp
file1 file2
you can do
$ ls /home/"$(whoami)"/tmp
file file2
In your specific case the single command become
head -n1 "/sys/bus/pci/devices/$(grep 0x017a /sys/bus/pci/devices/*/device | cut -d/ -f6)/resource" | cut -d ' ' -f 1 | tail -c 9
Notice I also quoted the entire expression, read here why you should do that.
answered Feb 12 at 10:40
jimmijjimmij
31.9k874108
add a comment |
To use the output of one command as argument of the second command the mechanism of command substitution $() can be utilized. For example:
Instead of
$ whoami
jimmij
$ ls /home/jimmij/tmp
file1 file2
you can do
$ ls /home/"$(whoami)"/tmp
file file2
In your specific case the single command become
head -n1 "/sys/bus/pci/devices/$(grep 0x017a /sys/bus/pci/devices/*/device | cut -d/ -f6)/resource" | cut -d ' ' -f 1 | tail -c 9
Notice I also quoted the entire expression, read here why you should do that.
answered Feb 12 at 10:40
jimmijjimmij
31.9k874108
To use the output of one command as argument of the second command the mechanism of command substitution $() can be utilized. For example:
Instead of
$ whoami
jimmij
$ ls /home/jimmij/tmp
file1 file2
you can do
$ ls /home/"$(whoami)"/tmp
file file2
In your specific case the single command become
head -n1 "/sys/bus/pci/devices/$(grep 0x017a /sys/bus/pci/devices/*/device | cut -d/ -f6)/resource" | cut -d ' ' -f 1 | tail -c 9
Notice I also quoted the entire expression, read here why you should do that.
answered Feb 12 at 10:40
jimmijjimmij
31.9k874108
edited Feb 12 at 20:06
answered Feb 12 at 10:40
jimmijjimmij
31.9k874108
answered Feb 12 at 10:40
jimmijjimmij
31.9k874108
answered Feb 12 at 10:40
jimmijjimmij
31.9k874108
31.9k874108
add a comment |
add a comment |
Use the $(command) syntax (or the older `command` syntax).
DEVICE=$(grep 0x017a /sys/bus/pci/devices/*/device | cut -d/ -f6)
head -n1 "/sys/bus/pci/devices/$DEVICE/resource" | cut -d ' ' -f 1 | tail -c 9
Oh. "Combine into a single expression" similarly.
DEVICE=$(grep 0x017a /sys/bus/pci/devices/*/device | cut -d/ -f6)
OUTPUT=$(head -n1 "/sys/bus/pci/devices/$DEVICE/resource" | cut -d ' ' -f 1 | tail -c 9)
echo "Output is $OUTPUT"
answered Feb 12 at 1:46
Ken JacksonKen Jackson
1063
May i know how can we combine both line into single line ?
– Seshagiri Lekkala
Feb 12 at 1:57
Get out of the habit of using ALLCAPS varnames: one day you'll usePATH=...and then wonder why your script is broken.
– glenn jackman
Feb 12 at 15:05
add a comment |
Use the $(command) syntax (or the older `command` syntax).
DEVICE=$(grep 0x017a /sys/bus/pci/devices/*/device | cut -d/ -f6)
head -n1 "/sys/bus/pci/devices/$DEVICE/resource" | cut -d ' ' -f 1 | tail -c 9
Oh. "Combine into a single expression" similarly.
DEVICE=$(grep 0x017a /sys/bus/pci/devices/*/device | cut -d/ -f6)
OUTPUT=$(head -n1 "/sys/bus/pci/devices/$DEVICE/resource" | cut -d ' ' -f 1 | tail -c 9)
echo "Output is $OUTPUT"
answered Feb 12 at 1:46
Ken JacksonKen Jackson
1063
May i know how can we combine both line into single line ?
– Seshagiri Lekkala
Feb 12 at 1:57
Get out of the habit of using ALLCAPS varnames: one day you'll usePATH=...and then wonder why your script is broken.
– glenn jackman
Feb 12 at 15:05
add a comment |
Use the $(command) syntax (or the older `command` syntax).
DEVICE=$(grep 0x017a /sys/bus/pci/devices/*/device | cut -d/ -f6)
head -n1 "/sys/bus/pci/devices/$DEVICE/resource" | cut -d ' ' -f 1 | tail -c 9
Oh. "Combine into a single expression" similarly.
DEVICE=$(grep 0x017a /sys/bus/pci/devices/*/device | cut -d/ -f6)
OUTPUT=$(head -n1 "/sys/bus/pci/devices/$DEVICE/resource" | cut -d ' ' -f 1 | tail -c 9)
echo "Output is $OUTPUT"
answered Feb 12 at 1:46
Ken JacksonKen Jackson
1063
Use the $(command) syntax (or the older `command` syntax).
DEVICE=$(grep 0x017a /sys/bus/pci/devices/*/device | cut -d/ -f6)
head -n1 "/sys/bus/pci/devices/$DEVICE/resource" | cut -d ' ' -f 1 | tail -c 9
Oh. "Combine into a single expression" similarly.
DEVICE=$(grep 0x017a /sys/bus/pci/devices/*/device | cut -d/ -f6)
OUTPUT=$(head -n1 "/sys/bus/pci/devices/$DEVICE/resource" | cut -d ' ' -f 1 | tail -c 9)
echo "Output is $OUTPUT"
answered Feb 12 at 1:46
Ken JacksonKen Jackson
1063
edited Feb 12 at 1:55
answered Feb 12 at 1:46
Ken JacksonKen Jackson
1063
answered Feb 12 at 1:46
Ken JacksonKen Jackson
1063
answered Feb 12 at 1:46
Ken JacksonKen Jackson
1063
1063
May i know how can we combine both line into single line ?
– Seshagiri Lekkala
Feb 12 at 1:57
Get out of the habit of using ALLCAPS varnames: one day you'll usePATH=...and then wonder why your script is broken.
– glenn jackman
Feb 12 at 15:05
add a comment |
May i know how can we combine both line into single line ?
– Seshagiri Lekkala
Feb 12 at 1:57
Get out of the habit of using ALLCAPS varnames: one day you'll usePATH=...and then wonder why your script is broken.
– glenn jackman
Feb 12 at 15:05
May i know how can we combine both line into single line ?
– Seshagiri Lekkala
Feb 12 at 1:57
May i know how can we combine both line into single line ?
– Seshagiri Lekkala
Feb 12 at 1:57
Get out of the habit of using ALLCAPS varnames: one day you'll use
PATH=... and then wonder why your script is broken.– glenn jackman
Feb 12 at 15:05
Get out of the habit of using ALLCAPS varnames: one day you'll use
PATH=... and then wonder why your script is broken.– glenn jackman
Feb 12 at 15:05
add a comment |
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Does
head -n1 /sys/bus/pci/devices/`grep 0x017a /sys/bus/pci/devices/*/device | cut -d/ -f6`/resource | cut -d ' ' -f 1 | tail -c 9work?– Hagen von Eitzen
Feb 12 at 1:01
I have tried but didn't work this way.
– Seshagiri Lekkala
Feb 12 at 1:09
what does command 2 return, what is the desired output?
– Evan Carroll
Feb 12 at 1:59
"head -n1 /sys/bus/pci/devices/00:00:01/resource | cut -d ' ' -f 1 | tail -c 9 " output is : da00000.
– Seshagiri Lekkala
Feb 12 at 2:03
Here, 00:00:01 is command 1 output.
– Seshagiri Lekkala
Feb 12 at 2:04