Ampersand at the beginning of a line in csh The 2019 Stack Overflow Developer Survey Results...
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Ampersand at the beginning of a line in csh
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What does an ampersand at the beginning of a line do in csh?
It seems to be ignored (with no error message), but why?
Example:
& echo 'hi there'
performs the expected echo without any error message.
linux unix shell command-line-interface
edited 1 min ago
Peter Mortensen
2,14242124
asked Feb 23 '10 at 16:23
JoelFanJoelFan
1,01541630
add a comment |
What does an ampersand at the beginning of a line do in csh?
It seems to be ignored (with no error message), but why?
Example:
& echo 'hi there'
performs the expected echo without any error message.
linux unix shell command-line-interface
edited 1 min ago
Peter Mortensen
2,14242124
asked Feb 23 '10 at 16:23
JoelFanJoelFan
1,01541630
add a comment |
What does an ampersand at the beginning of a line do in csh?
It seems to be ignored (with no error message), but why?
Example:
& echo 'hi there'
performs the expected echo without any error message.
linux unix shell command-line-interface
edited 1 min ago
Peter Mortensen
2,14242124
asked Feb 23 '10 at 16:23
JoelFanJoelFan
1,01541630
What does an ampersand at the beginning of a line do in csh?
It seems to be ignored (with no error message), but why?
Example:
& echo 'hi there'
performs the expected echo without any error message.
linux unix shell command-line-interface
linux unix shell command-line-interface
edited 1 min ago
Peter Mortensen
2,14242124
asked Feb 23 '10 at 16:23
JoelFanJoelFan
1,01541630
edited 1 min ago
Peter Mortensen
2,14242124
asked Feb 23 '10 at 16:23
JoelFanJoelFan
1,01541630
edited 1 min ago
Peter Mortensen
2,14242124
edited 1 min ago
Peter Mortensen
2,14242124
edited 1 min ago
Peter Mortensen
2,14242124
2,14242124
asked Feb 23 '10 at 16:23
JoelFanJoelFan
1,01541630
asked Feb 23 '10 at 16:23
JoelFanJoelFan
1,01541630
asked Feb 23 '10 at 16:23
JoelFanJoelFan
1,01541630
1,01541630
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
It's backgrounding "nothing". The ampersand also functions as a command delimiter like ;.
You'll find that
; echo 'hi there'
does (in this case) essentially the same thing.
These, however, are different:
sleep 10 ; echo 'hi' & echo 'there'
sleep 10 ; echo 'hi' ; echo 'there'
answered Feb 23 '10 at 17:47
Dennis WilliamsonDennis Williamson
50.8k1191127
add a comment |
It behaves this way because that's how the implementors of CSH decided it should be treated.
Seems like the csh family shells behave like this while the Bourne family of shells throw an error (since it is likely to be an input error)
answered Feb 23 '10 at 16:45
MikeyBMikeyB
33.2k784174
But what's the logic of it?
– JoelFan
Feb 23 '10 at 16:58
See Dennis's answer for the 'logic' of it.
– MikeyB
Feb 24 '10 at 2:49
add a comment |
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2 Answers
2
active
oldest
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2 Answers
2
active
oldest
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active
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active
oldest
votes
It's backgrounding "nothing". The ampersand also functions as a command delimiter like ;.
You'll find that
; echo 'hi there'
does (in this case) essentially the same thing.
These, however, are different:
sleep 10 ; echo 'hi' & echo 'there'
sleep 10 ; echo 'hi' ; echo 'there'
answered Feb 23 '10 at 17:47
Dennis WilliamsonDennis Williamson
50.8k1191127
add a comment |
It's backgrounding "nothing". The ampersand also functions as a command delimiter like ;.
You'll find that
; echo 'hi there'
does (in this case) essentially the same thing.
These, however, are different:
sleep 10 ; echo 'hi' & echo 'there'
sleep 10 ; echo 'hi' ; echo 'there'
answered Feb 23 '10 at 17:47
Dennis WilliamsonDennis Williamson
50.8k1191127
add a comment |
It's backgrounding "nothing". The ampersand also functions as a command delimiter like ;.
You'll find that
; echo 'hi there'
does (in this case) essentially the same thing.
These, however, are different:
sleep 10 ; echo 'hi' & echo 'there'
sleep 10 ; echo 'hi' ; echo 'there'
answered Feb 23 '10 at 17:47
Dennis WilliamsonDennis Williamson
50.8k1191127
It's backgrounding "nothing". The ampersand also functions as a command delimiter like ;.
You'll find that
; echo 'hi there'
does (in this case) essentially the same thing.
These, however, are different:
sleep 10 ; echo 'hi' & echo 'there'
sleep 10 ; echo 'hi' ; echo 'there'
answered Feb 23 '10 at 17:47
Dennis WilliamsonDennis Williamson
50.8k1191127
answered Feb 23 '10 at 17:47
Dennis WilliamsonDennis Williamson
50.8k1191127
answered Feb 23 '10 at 17:47
Dennis WilliamsonDennis Williamson
50.8k1191127
answered Feb 23 '10 at 17:47
Dennis WilliamsonDennis Williamson
50.8k1191127
50.8k1191127
add a comment |
add a comment |
It behaves this way because that's how the implementors of CSH decided it should be treated.
Seems like the csh family shells behave like this while the Bourne family of shells throw an error (since it is likely to be an input error)
answered Feb 23 '10 at 16:45
MikeyBMikeyB
33.2k784174
But what's the logic of it?
– JoelFan
Feb 23 '10 at 16:58
See Dennis's answer for the 'logic' of it.
– MikeyB
Feb 24 '10 at 2:49
add a comment |
It behaves this way because that's how the implementors of CSH decided it should be treated.
Seems like the csh family shells behave like this while the Bourne family of shells throw an error (since it is likely to be an input error)
answered Feb 23 '10 at 16:45
MikeyBMikeyB
33.2k784174
But what's the logic of it?
– JoelFan
Feb 23 '10 at 16:58
See Dennis's answer for the 'logic' of it.
– MikeyB
Feb 24 '10 at 2:49
add a comment |
It behaves this way because that's how the implementors of CSH decided it should be treated.
Seems like the csh family shells behave like this while the Bourne family of shells throw an error (since it is likely to be an input error)
answered Feb 23 '10 at 16:45
MikeyBMikeyB
33.2k784174
It behaves this way because that's how the implementors of CSH decided it should be treated.
Seems like the csh family shells behave like this while the Bourne family of shells throw an error (since it is likely to be an input error)
answered Feb 23 '10 at 16:45
MikeyBMikeyB
33.2k784174
answered Feb 23 '10 at 16:45
MikeyBMikeyB
33.2k784174
answered Feb 23 '10 at 16:45
MikeyBMikeyB
33.2k784174
answered Feb 23 '10 at 16:45
MikeyBMikeyB
33.2k784174
33.2k784174
But what's the logic of it?
– JoelFan
Feb 23 '10 at 16:58
See Dennis's answer for the 'logic' of it.
– MikeyB
Feb 24 '10 at 2:49
add a comment |
But what's the logic of it?
– JoelFan
Feb 23 '10 at 16:58
See Dennis's answer for the 'logic' of it.
– MikeyB
Feb 24 '10 at 2:49
But what's the logic of it?
– JoelFan
Feb 23 '10 at 16:58
But what's the logic of it?
– JoelFan
Feb 23 '10 at 16:58
See Dennis's answer for the 'logic' of it.
– MikeyB
Feb 24 '10 at 2:49
See Dennis's answer for the 'logic' of it.
– MikeyB
Feb 24 '10 at 2:49
add a comment |
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