Hello and Good day to all.
Im having a problem here and would like to know if there is any solution that could overcome my problem.
I have changed from bash to csh (c-shell) yesterday on my Linux 7.2. When i do $echo $SHELL i can see the output /bin/csh which means ihave succesfully landed on... (4 Replies)
Dear Members;
I changed ,by mistake ,the root shell in /etc/passwd and logged out. Thereafter, I can no more have a prompt when trynig to log in as root.
How to solve this pb ?
Regards :confused: (8 Replies)
Hi all,
until yesturday grep command was running in KSH ....
I was executing this command
ls -l | grep *.sh
But today its not working at all ...
Should I check any of the setting ...
I am not getting whats the problem ...
I have relogged to unix box but it didn't... (14 Replies)
Hi,
My sheel script has below statement:
if; then
When I run iam getting the below error:
-bash: syntax error near unexpected token `then'
What is wrong with that statement:
Plz help me. (2 Replies)
Hello!
Can you please help me on a lab at school:
I have to to write a shell program which reads all .C files from the current directory and prints for each file how many '#define' directives it has and for each macro defined how many times is it used in that file.
Can you suggest how can i... (1 Reply)
hi...i create a script which reads data from file and compare that the data which is entered by me through keyboard...i can easily read first two contents of file..i am facing the problem to read other contents..
structure of my file is
username:password:username1:password1.......and so on
... (1 Reply)
problem:
I give the source of a c program.. is required to indicate how many times is called each function defined in the program and line number
there is a call.
let's say i have lab2.c:
float dist(int *a,int *b,int n){
int i=0;
double d=0;
for (i=1;i<=n;i++){
d+=pow((a-b),2);
}... (4 Replies)
this picture for print You didn't do the question. Go back.
if $1 = 0
but until now it give me this message
what i should be do ?
http://img717.imageshack.us/img717/6137/eeevb.jpg (2 Replies)
Discussion started by: NeeZaaR
2 Replies
LEARN ABOUT CENTOS
shell-quote
SHELL-QUOTE(1) User Contributed Perl Documentation SHELL-QUOTE(1)NAME
shell-quote - quote arguments for safe use, unmodified in a shell command
SYNOPSIS
shell-quote [switch]... arg...
DESCRIPTION
shell-quote lets you pass arbitrary strings through the shell so that they won't be changed by the shell. This lets you process commands
or files with embedded white space or shell globbing characters safely. Here are a few examples.
EXAMPLES
ssh preserving args
When running a remote command with ssh, ssh doesn't preserve the separate arguments it receives. It just joins them with spaces and
passes them to "$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)