I have a friend at work that asked me a question today and I figured I would seek help here. How does a shell script know whether it is running in the background or not?
Thanks in advance for help (5 Replies)
I'm writing a PHP script which will take a given media file and convert it into a flash (flv) file. In addition to this, once the flv file has been generated I create two thumbnails (of different sizes) from the newly generated flv file.
In order to do this I'm calling ffmpeg from the command... (4 Replies)
Hi all,
I am having a script ScriptA which is calling a script ScriptB in the same server and copying files to second server and have to execute one script ScriptC in the second server. THis First script ScriptA is the main script and i have to execute this process continously.
for Keeping... (2 Replies)
Hi all,
I have a script that calls another program/script, xxx, to run in the background. Supposedly this program at most should finish within five (5) minutes so after five (5) minutes, I run some other steps to run the script into completion.
My problem is sometimes the program takes... (5 Replies)
I have a script called startWebLogic.sh which I was running in the background but the problem is which I used the command :- ps -elf | grep "startWebLogic.sh" | grep -v grep to find the process id but I was unable to find the process id for this script and when I checked from the front end the... (3 Replies)
I want to know what happens when you run a shell builtin or an external script, vs an external binary. For example: ls uses stat() etc... with details that are as simple as possible, I am not a programmer, I am a sys admin. (3 Replies)
Hi
I want to write a script for snoop which can do snoop for 30 min and then process should be killed automatically
I am using below codes
#!/usr/bin/ksh
snoop -d igb0 -o /opt/temp/abc.pcap
sleep 1500
kill -9 `ps -ef|grep -i snoop |grep -v grep|awk '{print $2}'`
But process is not... (3 Replies)
Hi I want to run two commands in background, i am using below way, but it is not working, i m calling these two commands from one script to another server where below commands are running, in my script ssh is working fine, but command is not going in background, please advise what should i do.
... (10 Replies)
Hi,
I want to write a script which continuously checking status of a script running in background by nohup command. And if same script is not running then immediately start the script...please help..
i am using below command to run script
nohup system_traps.sh &
but in some... (9 Replies)
I have script, which need some variable from user and i use below command for this
read
this script works fine while running without background, but when i run this script in background, it ask first variable then immediately it show below error
KSH variable not found
please let me... (1 Reply)
Discussion started by: pallvi_mahajan
1 Replies
LEARN ABOUT V7
escape
escape(1) Mail Avenger 0.8.3 escape(1)NAME
escape - escape shell special characters in a string
SYNOPSIS
escape string
DESCRIPTION
escape prepends a "" character to all shell special characters in string, making it safe to compose a shell command with the result.
EXAMPLES
The following is a contrived example showing how one can unintentionally end up executing the contents of a string:
$ var='; echo gotcha!'
$ eval echo hi $var
hi
gotcha!
$
Using escape, one can avoid executing the contents of $var:
$ eval echo hi `escape "$var"`
hi ; echo gotcha!
$
A less contrived example is passing arguments to Mail Avenger bodytest commands containing possibly unsafe environment variables. For
example, you might write a hypothetical reject_bcc script to reject mail not explicitly addressed to the recipient:
#!/bin/sh
formail -x to -x cc -x resent-to -x resent-cc
| fgrep "$1" > /dev/null
&& exit 0
echo "<$1>.. address does not accept blind carbon copies"
exit 100
To invoke this script, passing it the recipient address as an argument, you would need to put the following in your Mail Avenger rcpt
script:
bodytest reject_bcc `escape "$RECIPIENT"`
SEE ALSO avenger(1),
The Mail Avenger home page: <http://www.mailavenger.org/>.
BUGS
escape is designed for the Bourne shell, which is what Mail Avenger scripts use. escape might or might not work with other shells.
AUTHOR
David Mazieres
Mail Avenger 0.8.3 2012-04-05 escape(1)