06-07-2005
Quote:
Originally Posted by vibhor_agarwali
I have to quote it, does exec automatically quotes it parameters.
Thanks
Each filename is passes to exec as a single value, with special characters escaped, so it is as if the filename has been enclosed in single quotes.
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
What is the difference between sourcing a script, running it or execing it? (1 Reply)
Discussion started by: 98_1LE
1 Replies
2. Shell Programming and Scripting
Hi
I need to move multiple (say 10 files) from one location to another location. My selection would be like this...
ls -ltr *.arc | head ---> Need to move top 10 files with single command without iterating in loop. I know we can move files like this with find command but not sure if I can... (4 Replies)
Discussion started by: malaymaru
4 Replies
3. Shell Programming and Scripting
What I'm trying to do is perform a copy, well a ditto actually, on the results of a find command, but some inline string substitution needs to happen.
So if I run this code find ./ -name "*.tif" I get back these results.
.//1234567.tif
.//abcdefg.tif
Now the action from exec or xargs I... (2 Replies)
Discussion started by: myndcraft
2 Replies
4. AIX
Hi ,
Can somebody explain what is the difference in the below commands.. when using Xargs its giving all the hidden files and is it something xargs will do recursive searching or parsing ?
find . -type f -links 1 | xargs ls -li
find . -type f -links 1 | ls -li (1 Reply)
Discussion started by: Karthikeyan K
1 Replies
5. Shell Programming and Scripting
Hey all. Just a fast question, what is the technical difference between using back ticks and using xargs to perform a command?
Here's an example
Find /mydir -name *.conf |xargs rm
Vs
Rm 'find /mydir -name *.conf'
Is there a performance hit? I know they do the same thing but which is... (1 Reply)
Discussion started by: msarro
1 Replies
6. Programming
I have read several docs on these on the web and looked at examples. I can't figure out the difference. In some cases you use one or the other or you combine them.
can someone help me understand this? (1 Reply)
Discussion started by: guessingo
1 Replies
7. Shell Programming and Scripting
I have the following bash script lines in a file named test.sh.
#!/bin/bash
#
# Write Date to cron.log
#
echo "Begin SSI Load $(date +%d%b%y_%T)"
#
# Get the latest rates file for processing.
#
d=$(ls -tr /rms/data/ssi | grep -v "processed" | tail -n 1)
filename=$d
export filename... (3 Replies)
Discussion started by: ginowms
3 Replies
8. Shell Programming and Scripting
Hi All,
i'm trying to create a tar of all the .txt files i find in my dir . I've used xargs to acheive this but i wanted to do this with exec and looks like it only archives the last file it finds . can some one advice what's wrong here :
find . -type f -name "*.txt" -print0 | xargs -0... (9 Replies)
Discussion started by: Irishboy24
9 Replies
9. Shell Programming and Scripting
Hi,
What is the difference between the following commands
find . -type f -exec grep 'abc' {} \;
and
find . -type f | xargs grep 'abc'
Appreciate your help. (2 Replies)
Discussion started by: bobbygsk
2 Replies
10. Shell Programming and Scripting
Hello,
I am trying to move all the file listed by below command to /tmp/testing directory
find ./ -maxdepth 1 -type f -mtime +3
I tried using -exec and xargs - none of the combination is working?
Please, help (3 Replies)
Discussion started by: saurabh84g
3 Replies
LEARN ABOUT CENTOS
shell-quote
SHELL-QUOTE(1) User Contributed Perl Documentation SHELL-QUOTE(1)
NAME
shell-quote - quote arguments for safe use, unmodified in a shell command
SYNOPSIS
shell-quote [switch]... arg...
DESCRIPTION
shell-quote lets you pass arbitrary strings through the shell so that they won't be changed by the shell. This lets you process commands
or files with embedded white space or shell globbing characters safely. Here are a few examples.
EXAMPLES
ssh preserving args
When running a remote command with ssh, ssh doesn't preserve the separate arguments it receives. It just joins them with spaces and
passes them to "$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)