I will admit I am a newbie but I am trying to write some simple scripts
Situation:
I have a list of IP Addresses that I want to once or 2 times a day store the average ping response time in a database (mysql) I am part way there but not all the way there
I have the following
cat ./slow... (2 Replies)
I am performing a grep command and I need to know how to echo "NONE" or "0" to my file if grep does not find what i am looking for.
echo What i found >> My_File
grep "SOMETHING" >> My_File
I am sure this is easy, I am sort of new at this!
Thanks (2 Replies)
Hi,
I was wondering why ls * | echo does not print the contents of the directory to the screen? The way I see it, ls * returns a whole lot of information, and then we pipe all this info to echo, so surely it should all come to our screen!
Is there a serious flaw in my understanding?
... (3 Replies)
#!/bin/bash
INPUT=$1
if
then
INPUT=0$1
TRACKNUMBER=$INPUT
fi
TRACKNUMBER=$INPUT
echo "Track Number:" $TRACKNUMBER
if
then
echo "File Does Not Exist!: split-track"${TRACKNUMBER}".wav"
exit 0
fi
CUEFILE="$2" (6 Replies)
I have script like
echo -n FINISHED FEXP: ${TABLE2EXP}
echo $STATUS
I want the output of both the echo statement in one line
How can i do this (3 Replies)
Hi All,
I have code to get the UUID and capacity for the LUN from CX -arry. I need the output in this format
LUN Number UUID Space in MB
LUN 238 60:06:01:60:C2:56:11:00:28:36:67:59:11:04:DE:11 122880
But Now iam getting this... (3 Replies)
can someone please tell me who to sort the numerical output of echo?
UIO="8180 0 0 0 0 0 0 0 0 0 0 48240 48240 48240 48240 48240 48240 0 0 0 0 0 0 0 48300 0 0 0 48300"
echo $UIO | sort -n
This doesn't workk. it does not sort the numbers from smallest to highest. any ideas? (2 Replies)
Hello
i am trying to do some calculation from output command
for example
ls -l
if
then
echo "error"
else
echo "$"
fi
its something like this
which get strings from output command and try to sum total lines of this string if exceed certain number it display error
if not it... (3 Replies)
Hi,
Kindly help me to understand the behavior or logic of the below shell command
$ echo $!#
echo $echo $
$
$ echo !$#
echo $#
0
I am using GNU bash, version 3.2.25(1)-release (2 Replies)
Discussion started by: royalibrahim
2 Replies
LEARN ABOUT CENTOS
shell-quote
SHELL-QUOTE(1) User Contributed Perl Documentation SHELL-QUOTE(1)NAME
shell-quote - quote arguments for safe use, unmodified in a shell command
SYNOPSIS
shell-quote [switch]... arg...
DESCRIPTION
shell-quote lets you pass arbitrary strings through the shell so that they won't be changed by the shell. This lets you process commands
or files with embedded white space or shell globbing characters safely. Here are a few examples.
EXAMPLES
ssh preserving args
When running a remote command with ssh, ssh doesn't preserve the separate arguments it receives. It just joins them with spaces and
passes them to "$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)