How can I use grep command to display both matched and unmatched lines? Matched line should be in red and other lines should be in normal color.
Is there a grep option available to do that?
3 Answers
grep --color=always -e pattern -e '$'
answered Jul 23, 2014 at 10:26
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@Stéphane Chazelas: This does not work for me, matched pattern is not colored. Any suggestion? My
$TERMisvt100.cuonglm– cuonglm2014-07-23 10:38:54 +00:00Commented Jul 23, 2014 at 10:38 -
1@Gnouc, the vt100 terminal is monochrome. The first DEC terminal to support colors was VT241. But I doubt you're using a real VT100 terminal. In any case GNU
grepdoesn't use$TERM, it hardcodes the ANSI escape sequences (regardless of whether your terminal supports (or claims to support) them or not). Ifgrep 'x\|$'works, so shouldgrep -e X -e '^'though. Also, check your environment forGREP_COLORorGREP_COLORSvariables.Stéphane Chazelas– Stéphane Chazelas2014-07-23 10:50:20 +00:00Commented Jul 23, 2014 at 10:50 -
@StéphaneChazelas: Suprising,
grep 'x\|$'works butgrep -e X -e '^',GREP_COLORandGREP_COLORSboth are null. I'm on Windows machine, usingSecure Shell clientto connect to my Linux Server.cuonglm– cuonglm2014-07-23 10:54:13 +00:00Commented Jul 23, 2014 at 10:54 -
@StéphaneChazelas: Oh, after testing, I see that
grep -e X -e '^'works butgrep -e '^' -e Xlike your answer does not.cuonglm– cuonglm2014-07-23 10:55:47 +00:00Commented Jul 23, 2014 at 10:55 -
@Gnouc, which version of grep is that? I've updated the answer.Stéphane Chazelas– Stéphane Chazelas2014-07-23 11:42:49 +00:00Commented Jul 23, 2014 at 11:42
Try this:
grep --color=always -e 'pattern\|$' file
If you want to match other lines to have some context, you can use the -A and -B options:
grep --color=always -A 9 -B 9 -e pattern
will give you 9 lines of context. If this is not sufficient, you can increase this value.
grep "pattern" filename --color=alwaysman grep, the answer is hard to miss even if you put in minimal effort