03-10-2019
Quote:
Originally Posted by
Don Cragun
Hi johnprogrammer,
Welcome to the UNIX and Linux forums.
Thank you.
Quote:
Note that the problem being addressed in this thread didn't say anything about only wanting to remove spaces between parentheses on lines that also contain the string "httpd".
Note that the problem being addressed in this thread didn't say anything about only wanting to remove a single space between parentheses.
Note that the problem being addressed in this thread didn't say anything about only wanting to remove spaces between parentheses only lines that have exactly one <space> before the first parenthesis on that line.
Those were what I understood.
Quote:
Note that the problem being addressed in this thread didn't say anything about removing lines that do not contain spaces between parentheses.
Yes, I knew that, but I considered my answer as a good starting point.
Quote:
Please be careful about saying that your code works when it looks like the code that you have provided makes several assumptions that do not seem to match the requirements being addressed in this thread.
This is important, and you are right. I thought a few times to edit the post, and write: "I think this should work". But unfortunately I didn't. Sorry.
Last edited by johnprogrammer; 03-10-2019 at 03:37 AM..
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LEARN ABOUT DEBIAN
shell-quote
SHELL-QUOTE(1p) User Contributed Perl Documentation SHELL-QUOTE(1p)
NAME
shell-quote - quote arguments for safe use, unmodified in a shell command
SYNOPSIS
shell-quote [switch]... arg...
DESCRIPTION
shell-quote lets you pass arbitrary strings through the shell so that they won't be changed by the shell. This lets you process commands
or files with embedded white space or shell globbing characters safely. Here are a few examples.
EXAMPLES
ssh preserving args
When running a remote command with ssh, ssh doesn't preserve the separate arguments it receives. It just joins them with spaces and
passes them to "$SHELL -c". This doesn't work as intended:
ssh host touch 'hi there' # fails
It creates 2 files, hi and there. Instead, do this:
cmd=`shell-quote touch 'hi there'`
ssh host "$cmd"
This gives you just 1 file, hi there.
process find output
It's not ordinarily possible to process an arbitrary list of files output by find with a shell script. Anything you put in $IFS to
split up the output could legitimately be in a file's name. Here's how you can do it using shell-quote:
eval set -- `find -type f -print0 | xargs -0 shell-quote --`
debug shell scripts
shell-quote is better than echo for debugging shell scripts.
debug() {
[ -z "$debug" ] || shell-quote "debug:" "$@"
}
With echo you can't tell the difference between "debug 'foo bar'" and "debug foo bar", but with shell-quote you can.
save a command for later
shell-quote can be used to build up a shell command to run later. Say you want the user to be able to give you switches for a command
you're going to run. If you don't want the switches to be re-evaluated by the shell (which is usually a good idea, else there are
things the user can't pass through), you can do something like this:
user_switches=
while [ $# != 0 ]
do
case x$1 in
x--pass-through)
[ $# -gt 1 ] || die "need an argument for $1"
user_switches="$user_switches "`shell-quote -- "$2"`
shift;;
# process other switches
esac
shift
done
# later
eval "shell-quote some-command $user_switches my args"
OPTIONS
--debug
Turn debugging on.
--help
Show the usage message and die.
--version
Show the version number and exit.
AVAILABILITY
The code is licensed under the GNU GPL. Check http://www.argon.org/~roderick/ or CPAN for updated versions.
AUTHOR
Roderick Schertler <roderick@argon.org>
perl v5.8.4 2005-05-03 SHELL-QUOTE(1p)