(Doing this in reverse order, as I think the steps are best represented by what I actually type in.)<\/p>\n
Premise:
\nI’m a newbie who tries to do the nasty and make grep output always colored using GREP_OPTIONS. I have a file called test, with numbers 1-9 each on its own line.<\/p>\n
What I expect to happen:
\nFor all the numbers I grep from my file except 2 to be colored.<\/p>\n
What actually happens:
\nNeither when preceding the grep with GREP_OPTIONS when I grep 4, nor when GREP_OPTIONS is exported prior to grepping 5, is the resulting output colored.<\/p>\n
What does work:
\nPassing –color=always as a genuine grep parameter. Passing (for example) -V in GREP_OPTIONS either on the same line or exported.<\/p>\n
Additional notes:
\nThis crippling might be some kind of a safety measure to prevent all the breakage that doing what I’m attempting to do risks inflicting on the system. But I’ve not been able to find any documentation about such a design decision having been made, and in contrast, the man page to my understanding implies that this should, in fact, work.<\/p>\n
Steps to reproduce:<\/p>\n
jani@saegusa:~$ printenv | grep -i grep
\njani@saegusa:~$ grep 1 test # colored
\n1
\njani@saegusa:~$ grep 2 test | cat # not colored
\n2
\njani@saegusa:~$ grep –color=always 3 test | cat # colored
\n3
\njani@saegusa:~$ GREP_OPTIONS=’–color=always’ grep 4 test | cat # NOT colored!
\n4
\njani@saegusa:~$ export GREP_OPTIONS=’–color=always’
\njani@saegusa:~$ grep 5 test | cat # NOT colored!
\n5
\njani@saegusa:~$ export GREP_OPTIONS=’-V’
\njani@saegusa:~$ grep 6 test | cat # control
\ngrep (GNU grep) 2.10
\nCopyright \u00a9 2011 Free Software Foundation, Inc.
\nLisenssi GPLv3+: GNU GPL versio 3 tai my\u00f6h\u00e4isempi
\nT\u00e4m\u00e4 on vapaa ohjelma: voit vapaasti muuttaa ja jakaa sit\u00e4 edelleen.
\nOhjelmalla EI OLE TAKUUTA siin\u00e4 laajuudessa kuin laki sen sallii.<\/p>\n
Tekij\u00e4t: Mike Haertel ja muut, katso .<\/p>\n","protected":false},"excerpt":{"rendered":"
Neither when preceding with GREP_OPTIONS nor when GREP_OPTIONS is exported is the resulting output colored. Passing –color=always as a genuine grep parameter works, as does passing -V in GREP_OPTIONS.<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8860],"tags":[3415],"class_list":["post-2564","post","type-post","status-publish","format-standard","hentry","category-vianhallintajarjestelmat","tag-grep","sijainti-launchpad"],"_links":{"self":[{"href":"https:\/\/mummila.net\/kommentit\/wp-json\/wp\/v2\/posts\/2564","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mummila.net\/kommentit\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mummila.net\/kommentit\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mummila.net\/kommentit\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/mummila.net\/kommentit\/wp-json\/wp\/v2\/comments?post=2564"}],"version-history":[{"count":3,"href":"https:\/\/mummila.net\/kommentit\/wp-json\/wp\/v2\/posts\/2564\/revisions"}],"predecessor-version":[{"id":2567,"href":"https:\/\/mummila.net\/kommentit\/wp-json\/wp\/v2\/posts\/2564\/revisions\/2567"}],"wp:attachment":[{"href":"https:\/\/mummila.net\/kommentit\/wp-json\/wp\/v2\/media?parent=2564"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mummila.net\/kommentit\/wp-json\/wp\/v2\/categories?post=2564"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mummila.net\/kommentit\/wp-json\/wp\/v2\/tags?post=2564"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}