To anyone who can help greetings,
I am a beginner at Unix shell scripting and am taking a class.
The assignment question is as follows:
use a command-line tool named "itstat" which will display the resolution of an image file and some other lines of information. It accepts a list of image... (1 Reply)
To anyone who can help greetings,
I am a beginner at Unix shell scripting.
I need to know how to use the command line tool "itstat".
I understand it's application, however I cannot find any additional information.
Any assistance will be greatly appreciated. (3 Replies)
If I did indeed grep something out of it, why woudln't $result show nothing?
When I do $? , it does show success...
What is the proper syntax so that $result shows actual thing it's grepping out?
result=`(ssh $host tail -1 /something/somethingelse) | egrep -i "value" >dev/null`
#echo... (3 Replies)
Hi,
I am assaigning the output to the variable outp and when i try to loop thru the variable i see the original content $OUTPUT also in the array outp.
I dont want to have the original content in the array outp.
Please reply.
outp=$(echo $OUTPUT | awk '{FS = "|"}{
for(i=0;i<NF;i++)... (8 Replies)
Hi all and thanks for Your attention.
I need to run this set of commands on a remote machine...
rsh -l barut esfe1
sudo su - tode
tode deng.sh
exit (from rsh)
The problem is that when i rsh (or rlogin) i'm required a password.
How do I input the password (from the script not mannyally).... (4 Replies)
Testing for the presence/absence of a pattern in a file, using /bin/sh:
while read a;
do
b="${a##*pattern*}";
;
done < file
This returns 0 if there's a match. That signal ($?) can then be used outside the loop.
However this method reads through the whole file, even if the match... (2 Replies)
Hello,
I have a scenario for which I am trying to write a shell script and I have a question regarding the same. Here's the situation:
I am trying to copy a directory which consists of a few sub-directories and .c and .dat extension files say n number of times so that the copied file have... (3 Replies)
Hi guys,
I am wanting to create a script that will logon to HackThisSite.org and complete Programming Mission 11. You can find a link to this mission here for your reference:
www hackthissite org/missions/prog/11/
The following is what I have so far:
#!/bin/bash
USER="myUsername"... (0 Replies)
Unix script coding help?
i am trying to write a code that will display following menu to user:
(A) Add
(B) Subtract
(C) Multiply
(D) Divide
(E) Modulus
(F) Exponentiation
(G) Exit
Then ask user for choice (A-F). After taking users choice ask user for two numbers and
perform... (0 Replies)
I tried to run a command which simply generates SSH key with out prompting password.
After several trails , got the below command to run the script :
ssh-keygen -t rsa -N "" -f id_rsa
-N "" tells it to use an empty passphrase (the same as two of the enters in an interactive script)
-f... (0 Replies)
Discussion started by: ulaxmi
0 Replies
LEARN ABOUT CENTOS
shell-quote
SHELL-QUOTE(1) User Contributed Perl Documentation SHELL-QUOTE(1)NAME
shell-quote - quote arguments for safe use, unmodified in a shell command
SYNOPSIS
shell-quote [switch]... arg...
DESCRIPTION
shell-quote lets you pass arbitrary strings through the shell so that they won't be changed by the shell. This lets you process commands
or files with embedded white space or shell globbing characters safely. Here are a few examples.
EXAMPLES
ssh preserving args
When running a remote command with ssh, ssh doesn't preserve the separate arguments it receives. It just joins them with spaces and
passes them to "$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)