Different outputs when using break in bash
I wrote a simple script:
for DIR in /etc/*; do
if [ "$DIR" == "/etc/dhcp" ]; then
echo $DIR
break
fi
done
This works correctly but if I use break after fi it doesn't generate the desirable result.
What is the difference between that script and this one?
for DIR in /etc/*; do
if [ "$DIR" == "/etc/dhcp" ]; then
echo $DIR
fi
break
done
command-line bash scripts
edited Dec 16 '18 at 20:49
wjandrea
8,47842259
asked Dec 16 '18 at 7:36
Younes Nikkhah
6
add a comment |
I wrote a simple script:
for DIR in /etc/*; do
if [ "$DIR" == "/etc/dhcp" ]; then
echo $DIR
break
fi
done
This works correctly but if I use break after fi it doesn't generate the desirable result.
What is the difference between that script and this one?
for DIR in /etc/*; do
if [ "$DIR" == "/etc/dhcp" ]; then
echo $DIR
fi
break
done
command-line bash scripts
edited Dec 16 '18 at 20:49
wjandrea
8,47842259
asked Dec 16 '18 at 7:36
Younes Nikkhah
6
I edited your post and added some indentation. Feel free to revert it if you don't like it. But to my mind it is now clearer that in the second case thebreakis outside theif.
– PerlDuck
Dec 16 '18 at 11:43
2
@PerlDuck and that's why indentation is important. :P
– Kulfy
Dec 16 '18 at 12:38
What were the different outputs? And what were the inputs? Ah well, I suppose it doesn't really matter, maybe the title could be better
– Xen2050
Dec 17 '18 at 15:32
add a comment |
I wrote a simple script:
for DIR in /etc/*; do
if [ "$DIR" == "/etc/dhcp" ]; then
echo $DIR
break
fi
done
This works correctly but if I use break after fi it doesn't generate the desirable result.
What is the difference between that script and this one?
for DIR in /etc/*; do
if [ "$DIR" == "/etc/dhcp" ]; then
echo $DIR
fi
break
done
command-line bash scripts
edited Dec 16 '18 at 20:49
wjandrea
8,47842259
asked Dec 16 '18 at 7:36
Younes Nikkhah
6
I wrote a simple script:
for DIR in /etc/*; do
if [ "$DIR" == "/etc/dhcp" ]; then
echo $DIR
break
fi
done
This works correctly but if I use break after fi it doesn't generate the desirable result.
What is the difference between that script and this one?
for DIR in /etc/*; do
if [ "$DIR" == "/etc/dhcp" ]; then
echo $DIR
fi
break
done
command-line bash scripts
command-line bash scripts
edited Dec 16 '18 at 20:49
wjandrea
8,47842259
asked Dec 16 '18 at 7:36
Younes Nikkhah
6
edited Dec 16 '18 at 20:49
wjandrea
8,47842259
asked Dec 16 '18 at 7:36
Younes Nikkhah
6
edited Dec 16 '18 at 20:49
wjandrea
8,47842259
edited Dec 16 '18 at 20:49
wjandrea
8,47842259
edited Dec 16 '18 at 20:49
wjandrea
8,47842259
8,47842259
asked Dec 16 '18 at 7:36
Younes Nikkhah
6
asked Dec 16 '18 at 7:36
Younes Nikkhah
6
asked Dec 16 '18 at 7:36
Younes Nikkhah
6
6
I edited your post and added some indentation. Feel free to revert it if you don't like it. But to my mind it is now clearer that in the second case thebreakis outside theif.
– PerlDuck
Dec 16 '18 at 11:43
2
@PerlDuck and that's why indentation is important. :P
– Kulfy
Dec 16 '18 at 12:38
What were the different outputs? And what were the inputs? Ah well, I suppose it doesn't really matter, maybe the title could be better
– Xen2050
Dec 17 '18 at 15:32
add a comment |
I edited your post and added some indentation. Feel free to revert it if you don't like it. But to my mind it is now clearer that in the second case thebreakis outside theif.
– PerlDuck
Dec 16 '18 at 11:43
2
@PerlDuck and that's why indentation is important. :P
– Kulfy
Dec 16 '18 at 12:38
What were the different outputs? And what were the inputs? Ah well, I suppose it doesn't really matter, maybe the title could be better
– Xen2050
Dec 17 '18 at 15:32
I edited your post and added some indentation. Feel free to revert it if you don't like it. But to my mind it is now clearer that in the second case the
break is outside the if.– PerlDuck
Dec 16 '18 at 11:43
I edited your post and added some indentation. Feel free to revert it if you don't like it. But to my mind it is now clearer that in the second case the
break is outside the if.– PerlDuck
Dec 16 '18 at 11:43
2
2
@PerlDuck and that's why indentation is important. :P
– Kulfy
Dec 16 '18 at 12:38
@PerlDuck and that's why indentation is important. :P
– Kulfy
Dec 16 '18 at 12:38
What were the different outputs? And what were the inputs? Ah well, I suppose it doesn't really matter, maybe the title could be better
– Xen2050
Dec 17 '18 at 15:32
What were the different outputs? And what were the inputs? Ah well, I suppose it doesn't really matter, maybe the title could be better
– Xen2050
Dec 17 '18 at 15:32
add a comment |
1 Answer
1
active
oldest
votes
In simple terms, if the condition is met, the for loop will be terminated in the first script. But in the second script, the for loop will terminate irrespective of whether the condition is met or not. That for loop will be executed once. So, there is no benefit of a for loop in the second script since the results would be the same.
So, at the end of the first script, the value of DIR will be /etc/dhcp and an output will be there. But in the case of the second script, the value of DIR will be the name of the folder found at first. It may happen that it is /etc/dhcp. In that case the if condition will be executed and you'll see an output. But if the value of DIR is something else, then there will be no output.
edited Dec 16 '18 at 20:53
wjandrea
8,47842259
answered Dec 16 '18 at 7:44
Kulfy
3,58341139
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
In simple terms, if the condition is met, the for loop will be terminated in the first script. But in the second script, the for loop will terminate irrespective of whether the condition is met or not. That for loop will be executed once. So, there is no benefit of a for loop in the second script since the results would be the same.
So, at the end of the first script, the value of DIR will be /etc/dhcp and an output will be there. But in the case of the second script, the value of DIR will be the name of the folder found at first. It may happen that it is /etc/dhcp. In that case the if condition will be executed and you'll see an output. But if the value of DIR is something else, then there will be no output.
edited Dec 16 '18 at 20:53
wjandrea
8,47842259
answered Dec 16 '18 at 7:44
Kulfy
3,58341139
add a comment |
In simple terms, if the condition is met, the for loop will be terminated in the first script. But in the second script, the for loop will terminate irrespective of whether the condition is met or not. That for loop will be executed once. So, there is no benefit of a for loop in the second script since the results would be the same.
So, at the end of the first script, the value of DIR will be /etc/dhcp and an output will be there. But in the case of the second script, the value of DIR will be the name of the folder found at first. It may happen that it is /etc/dhcp. In that case the if condition will be executed and you'll see an output. But if the value of DIR is something else, then there will be no output.
edited Dec 16 '18 at 20:53
wjandrea
8,47842259
answered Dec 16 '18 at 7:44
Kulfy
3,58341139
add a comment |
In simple terms, if the condition is met, the for loop will be terminated in the first script. But in the second script, the for loop will terminate irrespective of whether the condition is met or not. That for loop will be executed once. So, there is no benefit of a for loop in the second script since the results would be the same.
So, at the end of the first script, the value of DIR will be /etc/dhcp and an output will be there. But in the case of the second script, the value of DIR will be the name of the folder found at first. It may happen that it is /etc/dhcp. In that case the if condition will be executed and you'll see an output. But if the value of DIR is something else, then there will be no output.
edited Dec 16 '18 at 20:53
wjandrea
8,47842259
answered Dec 16 '18 at 7:44
Kulfy
3,58341139
In simple terms, if the condition is met, the for loop will be terminated in the first script. But in the second script, the for loop will terminate irrespective of whether the condition is met or not. That for loop will be executed once. So, there is no benefit of a for loop in the second script since the results would be the same.
So, at the end of the first script, the value of DIR will be /etc/dhcp and an output will be there. But in the case of the second script, the value of DIR will be the name of the folder found at first. It may happen that it is /etc/dhcp. In that case the if condition will be executed and you'll see an output. But if the value of DIR is something else, then there will be no output.
edited Dec 16 '18 at 20:53
wjandrea
8,47842259
answered Dec 16 '18 at 7:44
Kulfy
3,58341139
edited Dec 16 '18 at 20:53
wjandrea
8,47842259
edited Dec 16 '18 at 20:53
wjandrea
8,47842259
edited Dec 16 '18 at 20:53
wjandrea
8,47842259
8,47842259
answered Dec 16 '18 at 7:44
Kulfy
3,58341139
answered Dec 16 '18 at 7:44
Kulfy
3,58341139
answered Dec 16 '18 at 7:44
Kulfy
3,58341139
3,58341139
add a comment |
add a comment |
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I edited your post and added some indentation. Feel free to revert it if you don't like it. But to my mind it is now clearer that in the second case the
breakis outside theif.– PerlDuck
Dec 16 '18 at 11:43
2
@PerlDuck and that's why indentation is important. :P
– Kulfy
Dec 16 '18 at 12:38
What were the different outputs? And what were the inputs? Ah well, I suppose it doesn't really matter, maybe the title could be better
– Xen2050
Dec 17 '18 at 15:32