10-06-2013
Quote:
Originally Posted by
Akshay Hegde
Thank you Scrutinizer... I just seen sorry
Don't be sorry, thanks for pointing it out, it is a valid point!
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1. Shell Programming and Scripting
hello,
i have an input file of about 50,00,000 lines. few of its lines are as follows:
<CR:0023498789,TPO-14987084;BO=IC&SUB=ALLP
<CF:0023498789,CB=YES;BIL&NC=NO
<CF:0023498789,CW=NO;NS=NO
<GC:0023498789,CG=YES;TPO&NC=YES
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2. Shell Programming and Scripting
Hi,
Im doing a script to find the number of lines included inside a file newly. These lines are in between #ifdef FLAG1 and #else or #endif or #else and #endif.
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a b
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4. UNIX for Advanced & Expert Users
Hello Everyone
I need your help in fixing this issue., I have a log file which has data of users logging in to an application.
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ISSessionValidated=N
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5. Shell Programming and Scripting
Hi all,
I have a file having data:
@HWUSI-EAS1727:19:6:1:3674:984:0:1#GTTAATA
NTTGGGTTTTCT
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NTTGGGTTTTCT
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42 network read failed
sv1 sv23 sv4
sv11 sv23 sv5 sv 7
48 client hostname could not be found
sv21 sv78 sv19 sv22
sv111 sv203 sv5 sv 33
49 client did not start
sv1 sv21
54 timed out connecting to client
sv2 sv4 sv12
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Hi,
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Hi,
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im using the following code to search a log for entries on two different lines:
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LEARN ABOUT CENTOS
shell-quote
SHELL-QUOTE(1) User Contributed Perl Documentation SHELL-QUOTE(1)
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 v5.16.3 2010-06-11 SHELL-QUOTE(1)