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Old 03-07-2014, 08:11 AM   #16
mirage1993
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Quote:
Originally Posted by suicidaleggroll View Post
You can return any number between 0-255
oh ...yes ...we often use 0 and 1.
 
Old 03-07-2014, 08:12 AM   #17
rtmistler
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You can return any value from 0-255; I don't think you can return negative numbers, nor numbers larger than 255.
 
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Old 03-08-2014, 03:05 AM   #18
mirage1993
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Quote:
Originally Posted by rtmistler View Post
You can return any value from 0-255; I don't think you can return negative numbers, nor numbers larger than 255.
if I return a negative number,it may display error information.But if I return 777,it would return 9 in fact .Because the Exit code is limited to 8 bits,so it's 00001001 rather than 1100001001...
 
Old 03-08-2014, 12:33 PM   #19
szboardstretcher
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Here is some proof of my grep claims.

Code:
## 'found' exit status
# grep -i 'end' text.txt
bend over linux
# echo $?
0

## 'not found' exit status
# grep -i 'asdf' text.txt 
# echo $?
1

## 'error' exit status
# grep -i82934rj 'enddasdf' text.txt 
grep: invalid option -- 'j'
Usage: grep [OPTION]... PATTERN [FILE]...
Try 'grep --help' for more information.
# echo $?
2
 
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