i'm trying to insert variable in a file with sed
I have variable $time and i want insert it in index.html file in specific string(line number 53):
the time: <span id="$time"></span>
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1Crossposting: stackoverflow.com/q/30685284/3776858Cyrus– Cyrus2015-06-06 17:07:36 +00:00Commented Jun 6, 2015 at 17:07
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1 Answer
If you want to edit your file in place, with a GNU sed, you can:
sed -i s/'$time'/$(date +%H:%M:%S)/ index.html
the trick here is correctly quoting. Notice that this will change the first $time in every line of your document with the time; you can limit to a specific line (say 53) with
sed -i 53s/'$time'/$(date +%H:%M:%S)/ index.html
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This is not correctly quoted. The output of that command substitution is subject both to
$IFSand filename generation - both of which can/will generate multiple fields. Combined with a/separator and the-ioption it's... well, it's not correctly quoted.mikeserv– mikeserv2015-06-06 19:17:02 +00:00Commented Jun 6, 2015 at 19:17 -
@mikeserv I agree it's possible to break it --- but with standard shell environment is quite safe. Almost anything can be broken with
alias date=whateverbefore.... but yes, strictly, you are right.Rmano– Rmano2015-06-06 21:17:36 +00:00Commented Jun 6, 2015 at 21:17 -
No. Aliases are only interpreted in command position and when unquoted. Your error is not a risk for affecting shell state as such - but what you are doing is calling a script editor with the unambiguous instruction that it should definitely modify and overwrite its input file, but with nothing but ambiguity as to what that input file should be - whatever it might be will depend entirely on the executing user's environment. It is not quite safe.mikeserv– mikeserv2015-06-06 21:50:34 +00:00Commented Jun 6, 2015 at 21:50