01-12-2009
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
I'm trying to check if files already exist in a directory. They have the same basename (exsyctr1), but 4 different extensions. If the files exist, then I make backups of them, then copy them from another directory ($livecomp/data) to the current one ($copycomp/data). If they don't exist, just... (5 Replies)
Discussion started by: Ypnos
5 Replies
2. UNIX for Advanced & Expert Users
can someone tell me the meaning of this commnad,
If you want to see a grand total of CPU time for a program when it finishes running, you can use the time command. At the Unix prompt, enter:
time java myprog
Replace myprog with the name of the program you are running. The following is an... (1 Reply)
Discussion started by: ldpathak
1 Replies
3. UNIX for Dummies Questions & Answers
Howdie everyone...
I have a shell script RemoveFiles.sh
Inside this file, it only has two commands as below:
rm -f ../../reportToday/temp/*
rm -f ../../report/*
My problem is that when i execute this script, nothing happened. Files remained unremoved. I don't see any error message as it... (2 Replies)
Discussion started by: cheongww
2 Replies
4. UNIX for Advanced & Expert Users
1|foo|bar
2|usa|ll
3|usa|vg
4|usa|vg
5|bar|vg
6|usa|vg
7|usa|ll
8|uk|nn
9|foo|manu|bar
10|uk|bb
11|foo|mm
12|kuwait|jkj
13|kuwait|mm
14|dubai|hh
awk '/foo/,/bar/' test_file1----command run at the prompt
output should have been the first 3 lines......
1|foo|bar (1 Reply)
Discussion started by: bishweshwar
1 Replies
5. UNIX for Dummies Questions & Answers
whoami | grep < $1 | echo $1
trying to write a script that finds out who the user is and then takes occurences of that username from a file that is passed as an argument and then displays it (6 Replies)
Discussion started by: iago
6 Replies
6. Linux
Can anyone explain how Graphic LCD (CSTN / STN) work in Unix...
From Graphic file thro driver code to display....?
Thanks (1 Reply)
Discussion started by: nat123
1 Replies
7. Linux
********nothing too see here!!!****** (2 Replies)
Discussion started by: TonyChapman
2 Replies
8. IP Networking
I have a client machine that was built and loaded with SCO UNIX 2.1.3, (yes it is old). The machine worked fine on the closed network that I tested on in my shop. I then had to change it to the network that it would be connected to. Below is the host file, router and subnet mask file that I usually... (0 Replies)
Discussion started by: NC user
0 Replies
9. Shell Programming and Scripting
My script work on Linux but not work in sun os.
my script.
logFiles="sentLog1.log sentLog2.log"
intial_time="0 0"
logLocation="/usr/local/tomcat/logs/"
sleepTime=600
failMessage=":: $(tput bold)Log not update$(tput rmso) = "
successMessage="OK"
arr=($logFiles)... (7 Replies)
Discussion started by: ooilinlove
7 Replies
10. IP Networking
hi all. and sorry for the random question, but this sparkled a raging flame-war at work and i want more points of view
situation
a router, with linux of some sort,
dhcp client requesting for ip in wan1 (as usual with wan ports)
dhcp server listening in lan1, and assigning ip (as usual... (9 Replies)
Discussion started by: broli
9 Replies
LEARN ABOUT DEBIAN
shell-quote
SHELL-QUOTE(1p) User Contributed Perl Documentation SHELL-QUOTE(1p)
NAME
shell-quote - quote arguments for safe use, unmodified in a shell command
SYNOPSIS
shell-quote [switch]... arg...
DESCRIPTION
shell-quote lets you pass arbitrary strings through the shell so that they won't be changed by the shell. This lets you process commands
or files with embedded white space or shell globbing characters safely. Here are a few examples.
EXAMPLES
ssh preserving args
When running a remote command with ssh, ssh doesn't preserve the separate arguments it receives. It just joins them with spaces and
passes them to "$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 v5.8.4 2005-05-03 SHELL-QUOTE(1p)