How to use regular expression result into another expression
Multi tool use
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 |
Your Answer
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "106"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f500075%2fhow-to-use-regular-expression-result-into-another-expression%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
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 |
Thanks for contributing an answer to Unix & Linux Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f500075%2fhow-to-use-regular-expression-result-into-another-expression%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
OhJ8qrorDaRy20J,C 0KdrSjhHYojli,onDR13CWERq,w2jg 74qEUyWhV9yOY6nGjeJf
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