#!/bin/sh -p


 
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# 1  
Question #!/bin/sh -p

What does -p mean here?
I see some script starts without -p.

Just wondering...?
# 2  
It means sh is the POSIX shell because Bourne shell does not support -p

-p turns off reading the .profile script when the shell starts up
# 3  
Question POSIX shell

In what kind of situation does the script need to start up the .profile?
# 4  
Only login shells read .profile and a shell script will not be a login shell. -p has another effect though. Reading the ENV file, if any, will not be done. Instead /etc/suid_profile will be read if it exists. This is mostly intended for increased security with suid shell scripts. Not all systems support suid scripts. But -p will always suppress reading the ENV file in any case.
 

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