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Old 04-17-2010, 01:05 AM   #1
shravee
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Registered: Sep 2009
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Post are they same " sh execution " and " ./ execution "


hi ,

i created a script file named myscript.sh

i ran this by typing sh myscript.sh and i got my output

but,

when i tried to execute by typing ./myscript.sh i received permission denied error
i gave permission as chmod 777 myscript.sh
then i executed by typing ./myscript.sh . It worked fine

so i wanted to know whether using sh and ./ with permissions are same.. ?



or did it work for only this.. are there any differences ???


regards
shravee

Last edited by shravee; 04-17-2010 at 01:07 AM.
 
Old 04-17-2010, 02:11 AM   #2
catkin
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I think sh myscript.sh starts a sh shell which then runs the script (so two processes) whereas ./myscript.sh runs the script in a subprocess (so one process). You can find out by putting a sleep in your script (so it "runs" for a long enough for you to ...) use pstree to see the process tree. Another difference is that sh myscript.sh runs the script using the sh shell whereas ./myscript.sh runs the script respecting any #!<interpreter path> on the first line of your script. Even if sh (/bin/sh?) is a symbolic link to bash (/bin/bash?) bash behaves differently depending on the name it is called by.

If you want to run your script simply by myscript.sh then you need to add "." (without the quotes) to your $PATH.
 
  


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