November 19, 2008 01:09am pst

1. Tintin 77,009
2. ozo 58,320
3. omarfarid 55,828
4. sunnycoder 19,350
5. Adam314 15,900
6. ravenpl 14,964
7. amit_g 11,700
8. MikeOM_... 9,600
9. ghostdog74 7,524
10. wilhelm_... 6,500
11. mikelfritz 6,400
12. woolmilkp... 5,750
13. duncan_roe 4,000
13. uetian1707 4,000
15. agriesser 3,700
16. FishMonger 3,560
17. Alundrez 3,500
18. tdiops 3,400
19. arnold 3,300
20. Redimido 3,200
20. edster9... 3,200
22. ahoffmann 3,020
23. routinet 3,000
24. hernst42 2,900
25. sirbounty 2,800
25. Mysidia 2,800

1. Tintin 95,099
2. ozo 85,967
3. omarfarid 56,076
4. ravenpl 22,128
5. sunnycoder 19,550
6. amit_g 15,900
6. Adam314 15,900
8. hernst42 11,320
9. MikeOM_... 9,600
10. ghostdog74 7,924
11. wilhelm_... 6,500
12. mikelfritz 6,400
13. woolmilkp... 5,750
14. ahoffmann 5,470
15. duncan_roe 5,250
16. Mysidia 4,800
17. nixfreak 4,664
18. uetian1707 4,000
19. FishMonger 3,860
20. agriesser 3,700
21. Alundrez 3,500
22. tdiops 3,400
23. arnold 3,300
24. Redimido 3,200
24. edster9... 3,200

07.21.2008 at 05:30AM PDT, ID: 23581518

	[x] Attachment Details

[x]

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9.0

How to kill parent shell/process from child subshell/process?

Asked by jrram in Bourne-Again Shell (bash), Linux, Shell Scripting

Tags: Linux, Red Hat, Bash

In the code below, I'm checking to make sure the correct # of parameters were passed into the script. If not, I'd like to display a message to the user, then exit the program.

Method #1:
The problem that I have here is since I enclosed my commands in (), a subshell gets created so when I call exit from the usage() function, only the subshell is killed and the rest of the code in my parent shell still executes. This of course causes an error since not all the necessary parameters are available.

Method #2:
I tried the commands w/o the (). The problem with this is the usage() function is always called regardless of if I have enough valid parameters or not.

So my question is 1) For Method 1, how do I kill off both the parent and child shell and for Method 2, how to I get the program to run both the echo statement and usage function in the main shell ONLY when its a valid error.Start Free Trial

         
             function usage () {
	echo "*** Not enough parameters ***"
        exit 1
}
 
#Method 1
[ $# -ne 6 ] && ( echo "Error: Incorrect number of parameters..." ; usage )
 
Method 2
[ $# -ne 6 ] && echo "Error: Incorrect number of parameters..." ; usage
 
#Rest of script...

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20081112-EE-VQP-42 / EE_QW_2_20070628

How to kill parent shell/process from child subshell/process?

Asked by jrram in Bourne-Again Shell (bash), Linux, Shell Scripting

Tags: Linux, Red Hat, Bash

About this solution