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Why study finite-dimensional vector spaces in the abstract if they are all isomorphic to R^n? if it hasn't found something (non-zero). Exit-status and Printf Doubt with usage of pipe Matching the Data of Two Different Files in Shell Script Debugging the Script White Papers & Webcasts Return Path Email Marketing Measurement Imperative Gallen, Switzerland Posts: 6,504 Thanks: 162 Thanked 533 Times in 466 Posts Assigning the substituted output of a command to a variable will simply contain it's output, ie. navigate here

Why does rotation occur? No need for grep, not twice or even once. kingsss replied Jun 19, 2012 I too not sure about this. test) command with exactly one argument--namely, ]--and then, since that will result in an error, echo "not found". @StéphaneChazelas, did I miss something? –Wildcard Sep 16 at 22:51 1 @Wildcard, http://www.gnu.org/software/grep/manual/html_node/Exit-Status.html

Grep Exit Code Always 0

Need a better layout, so that blank space can be utilized Does being engaged (to be married) carry any legal significance? Will Minecraft map items automatically update with terrain changes? My grep looks like this:- #grab the particular value let say "15" in this case in file a.txt i=`grep -n "^$char" a.txt|awk '{print $2}'` echo $i Output desired 1 Current Output Bob Diebel replied Jun 14, 2012 set -a BOB=`grep dnx ~/data/HOSTS ; echo "## $? ##"` echo $BOB echo $DIEBEL Top Best Answer 0 Mark this reply as the best answer?(Choose

However in the ps output, the string "bar" does not appear with the grep process. Thanks. Interactively carve up text files. Grep In If Statement Shell Script Thanks!

prints exit status of the command that was executed before grep not this grep command. –anubhava Dec 1 '14 at 6:22 All right, thanks that was what I needed Grep Always Return 0 share|improve this answer edited Jul 1 '11 at 20:33 answered Jul 1 '11 at 17:08 Sorpigal 15.2k33554 add a comment| up vote 2 down vote foo=`ps -ef | grep bar | ls /tmp/dne) echo Success $ ./test.sh + ls /tmp/dne ls: cannot access /tmp/dne: No such file or directory + echo Success Success $ mkdir /tmp/dne $ ./test.sh + ls /tmp/dne $ http://unix.stackexchange.com/questions/294371/how-to-obtain-grep-exit-status-into-a-variable oracle8 UNIX for Advanced & Expert Users 1 10-22-2001 12:34 AM All times are GMT -4.

So personally I gave up on grep for this and used awk. Grep Exit Code 0 How smart is the original Ridley Scott Xenomorph really? This means you can use grep to check if a pattern exists and then look at the exit command $? A counter example for Sard's theorem in the case C^1 Why does Harry address the Weasley-parents with "Mr. & Mrs"?

Grep Always Return 0

chrism01 View Public Profile View LQ Blog View Review Entries View HCL Entries Find More Posts by chrism01 12-17-2007, 06:45 PM #6 unSpawn Moderator Registered: May 2001 Posts: 29,332 http://stackoverflow.com/questions/15367674/bash-one-liner-to-exit-with-the-opposite-status-of-a-grep-command By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. Grep Exit Code Always 0 but if the pattern is not found, greps exits with one, so shouldn't it be one? –tonix Dec 1 '14 at 6:19 1 grep -E '^nothing' List.txt | echo $? Grep If Statement As a part of this script, I need to be able to check if the first argument given matches the first word of file.

This is what happens: Code: $ s=`echo 'abc def'|grep 'xxx'` $ echo $? 1 $ s=`echo 'abc def'|grep 'abc'` $ echo $? 0 Remove advertisements Sponsored Links Franklin52 check over here FILE: contour-styles.css STATUS: Busted FAILURES: 1 failure Id's should not be styled 1. #asdf regex bash grep exit exit-code share|improve this question edited Mar 12 '13 at 18:29 asked Mar 12 UNIX is a registered trademark of The Open Group. Browse other questions tagged regex bash grep exit exit-code or ask your own question. Bash If Grep True

Ramesh Reddy replied Jun 19, 2012 $? The way I code them is basically if the condition stated fulfill, the value of q shall be updated. So, if you wanted to check that the pattern is matched 3 or more times, you would do: if [ "$(grep -c "^$1" schemas.txt)" -ge 3 ]; then ... his comment is here Is this a scam?

Hot Network Questions Is there any indication in the books that Lupin was in love with Tonks? Grep Silent Code: if [ $isVoid -eq 0 ] then echo "Is Void matched" $isVoid fi = is an assignment operator If you grep for "isVoid\(\)" the output of grep should never be Thx :) –George Kastrinis Jul 1 '11 at 16:20 3 The first is better in that it also works with "-o pipefail", another good fail-fast setting for bash similar to

That means the shell will have to store the whole output in memory and wait for it to finish.

Do EU residents need visa to travel to USA? is exit code of above grep command 0= string exist 1= string does not exist. Coprimes up to N Did Malcolm X say that Islam has shown him that a blanket indictment of all white people is wrong? Grep Invert Exit Code Word that means "to fill the air with a bad smell"? 3% personal loan online.

You will see something returned by echo $output command, only if there is a match, i.e., if grep succeeds. EXIT CODE s/b 0 OR 1 (NON-ZERO) Top Best Answer 0 Mark this reply as the best answer?(Choose carefully, this can't be changed) Yes | No Saving... If [ -n $output ] means if $output is not empty, (which means, if grep succeeds). weblink How should I position two shelf supports for the best distribution of load?

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