CODEWITHSUNDEEP
bashpidps
Jim Hudd
Jim Hudd

Reputation: 47

Why can't I see my script on ps program output?

I have a simple script (x.sh):

echo $$
sleep 60

when I run this and "ps -ef | grep x.sh" I get nothing back. Running "ps -ef | grep " I get:

jsm_adm+  7695  5700  0 12:25 pts/0    00:00:00 -bash
jsm_adm+  7696  7695  0 12:25 pts/0    00:00:00 sleep 60
jsm_adm+  7698  5841  0 12:25 pts/1    00:00:00 grep --color=auto 7695

If I add "#!/bin/bash" as the first line x.sh then I get get:

jsm_adm+  7693  5700  0 12:25 pts/0    00:00:00 /bin/bash ./x.sh
jsm_adm+  7694  7693  0 12:25 pts/0    00:00:00 sleep 60
jsm_adm+  7701  5841  0 12:25 pts/1    00:00:00 grep --color=auto 7693

Is there a way I can find that "x.sh" is running if the user hasn't put a hashbang as the first line of their script? Also, what does "-bash" mean in this context?

Upvotes: 0

Views: 371

Answers (1)

KiaMorot
KiaMorot

Reputation: 1746

Because you do not have a bash script in this x.sh file. The problem is exactly the hashtag #!/bin/bash you describe. If you do not put it into your file bash does not interpret your file as bash script. If you want to know more you could navigate to this guide and have a look.

What occurs in your case is without the hashtag both command are interpreted as if you were typing them directly in the shell which you could observe in your first ps output as you see the program sleep(60).

Upvotes: 1

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