05-04-2010
Quote:
Originally Posted by
ejdv
Perhaps later I will have a go at it and integrate the Perl program into the C program.
Vice versa sounds a better idea if you want to avoid C entirely. C has a lot of "gotchas" that may surprise you if you're not familiar with the language.
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Hi,
I am presently stuck in a csv file.
INPUT CSV
baseball,NULL,8798765,Most played
baseball,NULL,8928192,Most played
baseball,NULL,5678945,Most played
cricket,NOTNULL,125782,Usually played
cricket,NOTNULL,678921,Usually played
EXPECTED OUTPUT CSV
... (7 Replies)
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Hi,
I have a comma (,) delimited file, in which few fields are enclosed with in double quotes " ". I have to print the records in the file which donot have expected number of field with the line number.
File1
====
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3. Shell Programming and Scripting
Hi All,
I am in middle of one script. I want output in the form of xls file.
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4. Shell Programming and Scripting
Hi
I have written below script to get the data in table form.
#!/bin/sh
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do
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if ; then
echo "directory"
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echo "symbolic link"
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else
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5. Shell Programming and Scripting
lyang001@lyang001-OptiPlex-9010:~$ service --status-all |grep dbus
acpid
acpi-support
alsa-restore
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apport
atd
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Good Moring,
I am currently reading about awk in a manual and following the examples using the oratab file.
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8. Shell Programming and Scripting
#cat /tmp/input
old_array old_dev new_dev new_array
0577 008AB 01744 0125
0577 008AC 01745 0125
0577 008AD 005C8 0125
0577 008AE 005C9 0125
0577 008AF 005CA 0125
0577 008B0 005CB 0125
0577 008B1 005CC 0125
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Hello,
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i/p data
c1,c2,c3
1,a,b
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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)