Hi Gurus,
Could you please help me to create a shell script that will be started by a cron job once every night at 24.00 h (that should bee easy:))
The shell script should control every 30 seconds the name of a process, and when the process doesn't run anymore it should execute a few further... (12 Replies)
Hi all,
I need a script that will loop around all the current processes and take a pmap -x <process id> and output each pmap to a separate file.
Would anyone have a quick command to do this? (2 Replies)
for two txt files, f1 and f2, I like to do the following
grep "abcde" f1 > abcde$f1
grep "xyz" f1 > xyz$f1
can I use a loop to get this done? Thanks
for i in f1 f2
do
grep "abcde" $i > abcde$i
grep "xyz" $i > xyz$i
...
done (11 Replies)
Hi,
I want to create a script who will check if the java process is running & if it finds the process is still there it continues to execute & when the process completes it exit from the script.
I have written a code to check & notify the process existence but i am not getting how to write... (4 Replies)
I have multiple input files that I want to manipulate using a shell script. The files are called 250.1 through 250.1000 but I only want the script to manipulate 250.300 through 250.1000. Before I was using the following script to manipulate the text files:
for i in 250.*; do
|| awk... (4 Replies)
I have the following code running against a file. The file can have upwards of 10000 lines.
problem is, the for loop takes a while to go through all those lines. is there a faster way to go about it?
for line in `grep -P "${MONTH} ${DAY}," file | ${AWK} -F" " '{print $4}' | awk -F":"... (2 Replies)
Hi,
I have a script which triggers an infinite loop.
#!bin/bash
trig=`ls /home/trig.tch |wc -l`
function callj {
some commands...
}
while
do
callj &
done
The number of process after doing a ps -ef |grep Mon.sh returns
processes even after the script is killed by deleting the... (4 Replies)
Hi, I have written a script that allows me to repetitively play a music file $N times, which is specified through user input. However, if I want to exit the script before it has finished looping $N times, if I use CTRL+c, I have to CTRL+c however many times are left in order to complete the loop.... (9 Replies)
Hi
I have following codecd /tmp/test/
for vfile in `ls -1`
do
for vlink in `ls -l /tmp/testfile/*|bin/grep "local/init\.d/$vfile$"|bin/awk -F"->" '{print($1)}'|bin/awk -F"/" '{print($NF)}'`
I know `ls -1` list only file, but I don't... (3 Replies)
I have a folder with files and I have to process them in a loop. However the filenames have space characters, so the list get split.
$ touch "File Number_1"
$ touch "File Number_2"
$ ls "/tmp/File Number"_*
/tmp/File Number_1 /tmp/File Number_2
I tried following (sorry for using the... (3 Replies)
Discussion started by: Wernfried
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)