Hi ,
this is the first time i use bc to calculate and i would have decimal result , i use the following :
toto=400;scale=1 echo $toto / 1000|bc
scale to adjust the numbers after the command would have in this case 0.4 as result and i wonder why i have always 0 as result.
Somebody can... (2 Replies)
I was wondering can anyone give me a clue how to start script which would do the following:
I have 2 numbers as input for example: 100 and 1000 and I need to create file and in that file should be written
100 - 199
200 - 299
300 - 399
400 - 499
500 - 599
600 - 699
700 - 799... (3 Replies)
About 4 years ago I wrote this tool inspired by Rob Urban's collect tool for DEC's Tru64 Unix. What makes this tool as different as collect was in its day is its ability to run at a low overhead and collect tons of stuff. I've expanded the general concept and even include data not available in... (0 Replies)
Hi everyone,
I need to write a script to calculate the space for sub-folders under /home:
Here is the scanrio:
cd /home
drwxr-xr-x 57 root root 8192 Jan 22 16:13 home_1
drwxrwxrwx 69 root root 8192 Jan 29 10:36 home_2
drwxr-xr-x 97 root root 8192 Nov... (8 Replies)
i have 3 files like
total.dat=18
equal.dat=14
notequal.dat=16
i need find the equal percentange means:
equalpercentage = ($equal.dat / $total.dat * 100)
How i can do this ?
I tried some of the answers to calculate the percentage in this forums.but it couldn't worked.Some one please... (6 Replies)
I have 2 variables in my shell scripts in which i am using awk and calculating 2 files and getting 2 different variable called in_total and out_total. I want to subtract one variable from another so plz tell me how i can do that.
Example is:
cat in_file | awk -F: '{
in_total += $1 * 86400... (3 Replies)
Hello,
I'm trying to create a shell script (#!/bin/sh) which should tell me the age of a file in minutes...
I have a process, which delivers me all 15 minutes a new file and I want to have a monitoring script, which sends me an email, if the present file is older than 20 minutes.
To do... (10 Replies)
i have file input
abcedef|wert|13|03|10|04|23|A1|13|05|01|09|31
fsdasdf|ferg|12|04|25|21|21|A1|13|02|26|20|31
dfsfsad|gerg|12|04|25|21|21|A1|13|02|25|25|31
i expect the output
abcedef|wert|13|03|10|04|23|A1|13|05|01|09|31|9.516666667... (5 Replies)
If there are 2 records for an Employee, How can I choose the one with eff_status = ‘Active' and ignore the eff_status ='Terminated'. if there is only one record, then just write that record regardless of the eff_status.
Please assist. (1 Reply)
Discussion started by: Harimalyala
1 Replies
LEARN ABOUT CENTOS
shell-quote
SHELL-QUOTE(1) User Contributed Perl Documentation SHELL-QUOTE(1)NAME
shell-quote - quote arguments for safe use, unmodified in a shell command
SYNOPSIS
shell-quote [switch]... arg...
DESCRIPTION
shell-quote lets you pass arbitrary strings through the shell so that they won't be changed by the shell. This lets you process commands
or files with embedded white space or shell globbing characters safely. Here are a few examples.
EXAMPLES
ssh preserving args
When running a remote command with ssh, ssh doesn't preserve the separate arguments it receives. It just joins them with spaces and
passes them to "$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)