01-17-2007
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
I am new and I would like to know your opinion on the best Unix shell for linux? :confused: (4 Replies)
Discussion started by: faron17
4 Replies
2. UNIX for Advanced & Expert Users
when i use the following command
find / -name '*.*' -exec grep -il 'text' {} \;
I can redirect the errors to /dev/null. This happens only in ksh but not in csh. the 2>/dev/null is not working in csh. Can you some one suggest an alternative for this in csh ? (3 Replies)
Discussion started by: dhanamurthy
3 Replies
3. Shell Programming and Scripting
Hi Friends,
I am new for this site.i have a small query.plz let me know the command to find in which shell presently i am working. (2 Replies)
Discussion started by: pineapple
2 Replies
4. UNIX for Advanced & Expert Users
Hi experts,
I have a shell script (korn shell on aix) where I am giving find command with file options which are read from a configuration file. For some reason I am getting an error find: 0652-017. I have put set -x in the shell script and the command looks okay. If I cut it and paste it in the... (6 Replies)
Discussion started by: kodermanna
6 Replies
5. Shell Programming and Scripting
Okie here is my problem,
1. I have a directory with a ton of files.
2. I want to first get an input on how many days ago the files were created.
3. I will take those files and put it into another file
4. Then I will take the last # from each line and subtract by 1 then diff the line from the... (1 Reply)
Discussion started by: bigboizvince
1 Replies
6. UNIX for Advanced & Expert Users
hi,
i need to clear data off a DOA backup drive.
i try this, but just get a file {} in . and no change on the backup drive.
bash shell
find /mnt/usbbackup -xdev -type f -exec echo `date` > {} \;
any ideas? thanks. :) (1 Reply)
Discussion started by: drewnichols
1 Replies
7. UNIX for Dummies Questions & Answers
I have a script that has the following command:
find /home/user -name test.dat
The script works as desired when running normally. However, when I run the script preceding it with 'sh', it fails. Is there something I need to account for when preceding the execution of the script with 'sh'? (1 Reply)
Discussion started by: bsavitch
1 Replies
8. Shell Programming and Scripting
Hello
My question is: How to find out the shell of the shell script which we are running? I am writing a script, say f1.sh, as below:
#!/bin/ksh
echo "Sample script"
From the first line, we can say this script will run in ksh. But, how can we prove it? Can we print anything inside... (6 Replies)
Discussion started by: guruprasadpr
6 Replies
9. Shell Programming and Scripting
Hi all,
Please i need an explanation for the following statements
ref_file=/tmp/cleanfiles export ref_file
touch `TZ=WAT+2 date "+%Y%m%d%H%M"` $ref_file
find . ! -name . -prune -type f ! -newer $ref_file -exec store_file.sh {} \; (1 Reply)
Discussion started by: anish_1982
1 Replies
10. Shell Programming and Scripting
Hello All
Below is code snippet i am using
find . -name "*.txt" -mtime +5 -exec -touch "*.txt" {} +
The purpose is to make the files with name *.txt to be of size 0 kb if it is older than 5 days.With above code i am unable to do so.I know alternative is to use if/else loop but i would like... (3 Replies)
Discussion started by: vinil
3 Replies
LEARN ABOUT CENTOS
shell-quote
SHELL-QUOTE(1) User Contributed Perl Documentation SHELL-QUOTE(1)
NAME
shell-quote - quote arguments for safe use, unmodified in a shell command
SYNOPSIS
shell-quote [switch]... arg...
DESCRIPTION
shell-quote lets you pass arbitrary strings through the shell so that they won't be changed by the shell. This lets you process commands
or files with embedded white space or shell globbing characters safely. Here are a few examples.
EXAMPLES
ssh preserving args
When running a remote command with ssh, ssh doesn't preserve the separate arguments it receives. It just joins them with spaces and
passes them to "$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)