hi i'm new to shell scripts and have a small problem
i am running a batch converter that returns all flash .flv files in a directory and create a png image from each one
the problem i have is the $1 variable , its ok on the first call but on the secound call $1.png , i have extra... (1 Reply)
I need to remove the entire file contents in file using the shell script.
Actually the grap -v command will create one more file and it occupy the space also.
I need to remove the entire file contents without creating new file using the shell scripting.
Please help me. (5 Replies)
Hey all. I am trying to write some scripts and need some assistance.
One:
I already have a script that appends lines to a file. I need a script that will remove those lines from that file, and have no idea how to go about doing this. Just need the command (if any) that can remove lines.
... (2 Replies)
The file starts like this:
Directory: <path to the script>
Script: <script fife name>
#!bin/ksh
##Comments
<actual script>
What is the use of the first two lines in the script? What if I save the file without them? What will be the effect? They are not comments. Im very new to this,... (4 Replies)
I want to make a config file which contain all the paths.
i want to read the config file line by line and pass as an argument on my below function.
Replace all the path with reading config path line by line and pass in respective functions.
how can i achieve that?
Kindly guide.
... (6 Replies)
Hi All, Looking for a quick LINUX shell script which can continuously monitors the flle size, report the process which is creating a file greater than certain limit and also kill that process. Can someone please help me on this? (4 Replies)
I wish to by pass a process if the file is over a certain size?
not sure this makes sense
current bit of the script below
#if we are bypAssing the OCR
if ; then
echo Bypassing HOTFOLDER OCR
HOT_FOLDER_DIR=$BATCH_POST_OCR_DIR;
potential change below? would this work would I need... (1 Reply)
Hello,
I have a src code file where I need to uncomment many lines.
The lines I need to uncomment look like,
C CALL l_r(DESNAME,DESOUT, 'Gmax', ESH(10), NO_APP, JJ)
The comment is the "C" in the first column. This needs to be deleted so that there are 6 spaces preceding "CALL".... (7 Replies)
Discussion started by: LMHmedchem
7 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)