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From Chris Twinn
Answered By Ben Okopnik
I am trying to write a little bash script to update the crontab on RH7. Problem is that when I put
linetext = $1" * * * * " root bash /etc/cron.hourly/myscript or
[Ben] Don't do that; you can't have any spaces around the '=' sign in variable assignment.
linetext=$1" * * * * " root bash /etc/cron.hourly/myscript
I get back "2 configure ipchaser 2 configure ipchaser" which is an ls of that current directory fronted by the number 2 in my variable at each point of the star's.
[Ben] Sure; it's doing exactly what you've asked it to do. Text in the weak (double) quotes is interpreted/interpolated by the shell; "*" does indeed mean "all files in the current directory". However, strong (single) quotes treat the enclosed text as a literal string; so does quoting it on assignment and output.
linetext=$1' * * * * root bash /etc/cron.hourly/myscript' linetext="$1 * * * * root bash /etc/cron.hourly/myscript"
Either one of the above would result in "$linetext" containing
2 * * * * root bash /etc/cron.hourly/myscript
(this assumes that "$1" contains '2'.) Note that you have to echo it as
Otherwise, "bash" will still interpret those '*'s.
... he cheerfully reported back, his problem is solved ...
[Ben] On this side of the pond, the expression is "Duuuuude."
Many Many Thanks.
[Ben] Good to know you found it useful, Chris.
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