While loop breaks after the first iteration
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0
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This is my script which breaks on while loop after the first iteration
while IFS='' read -r line
do
cd /root/clair-container-scan
image_name=$(echo $line|cut -d '/' -f2|cut -d ':' -f1)
sh clair-container-scan.sh $line >> /root/clair-container-scan/$image_name.log
done < "$1"
The $1 refers to the file which has the below inputs to it.
kardasz/mysql:latest
visualops/httpd:latest
Most of them refer this to the STDOUT problem, so have already tried changing the >> redirection to ">" , "&>" , "&>>" but still didn't work.
The command that redirects the output to .log file will run for more than a minute. Sometimes it will not even run the first iteration and will simply give an empty output.
Can someone please help me understand what is wrong in the script?
shell while-loop stdout
edited Nov 12 at 5:35
u__
2,572929
asked Oct 11 at 12:05
Nishanth
85
add a comment |
up vote
0
down vote
favorite
This is my script which breaks on while loop after the first iteration
while IFS='' read -r line
do
cd /root/clair-container-scan
image_name=$(echo $line|cut -d '/' -f2|cut -d ':' -f1)
sh clair-container-scan.sh $line >> /root/clair-container-scan/$image_name.log
done < "$1"
The $1 refers to the file which has the below inputs to it.
kardasz/mysql:latest
visualops/httpd:latest
Most of them refer this to the STDOUT problem, so have already tried changing the >> redirection to ">" , "&>" , "&>>" but still didn't work.
The command that redirects the output to .log file will run for more than a minute. Sometimes it will not even run the first iteration and will simply give an empty output.
Can someone please help me understand what is wrong in the script?
shell while-loop stdout
edited Nov 12 at 5:35
u__
2,572929
asked Oct 11 at 12:05
Nishanth
85
we would need to see an Minimal, Complete, and Verifiable example version of yourclair-container-scan.sh, it's quite possible something is wrong and causing anexitthere. Good luck.
– shellter
Oct 11 at 14:47
I would also recommend doing some debugging on your own. First run your code (all of it) thru shellcheck.net . Then if those fixes don't resolve your problem, addecho "line=$line"andecho "image_name=$image_name"in appropriate places to see what is happening. If that doesn't highlight where the problem is, then addset -xbefore thewhileloop andset +xhave the while loop. You may need to add the same inside of yourclair-container-scan.sh. Good luck.
– shellter
Oct 11 at 14:50
Will you while loop work as expected when you replacesh clair-container-scan.sh $linewithecho "line=${line}."
– Walter A
Oct 11 at 22:03
Consider redirecting the standard input ofclair-container-scan.shfrom/dev/null. If it reads standard input, then your main loop won't get a chance. You could also consider reading from a file descriptor other than standard input with theread -u Ncommand.
– Jonathan Leffler
Oct 12 at 3:12
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
This is my script which breaks on while loop after the first iteration
while IFS='' read -r line
do
cd /root/clair-container-scan
image_name=$(echo $line|cut -d '/' -f2|cut -d ':' -f1)
sh clair-container-scan.sh $line >> /root/clair-container-scan/$image_name.log
done < "$1"
The $1 refers to the file which has the below inputs to it.
kardasz/mysql:latest
visualops/httpd:latest
Most of them refer this to the STDOUT problem, so have already tried changing the >> redirection to ">" , "&>" , "&>>" but still didn't work.
The command that redirects the output to .log file will run for more than a minute. Sometimes it will not even run the first iteration and will simply give an empty output.
Can someone please help me understand what is wrong in the script?
shell while-loop stdout
edited Nov 12 at 5:35
u__
2,572929
asked Oct 11 at 12:05
Nishanth
85
This is my script which breaks on while loop after the first iteration
while IFS='' read -r line
do
cd /root/clair-container-scan
image_name=$(echo $line|cut -d '/' -f2|cut -d ':' -f1)
sh clair-container-scan.sh $line >> /root/clair-container-scan/$image_name.log
done < "$1"
The $1 refers to the file which has the below inputs to it.
kardasz/mysql:latest
visualops/httpd:latest
Most of them refer this to the STDOUT problem, so have already tried changing the >> redirection to ">" , "&>" , "&>>" but still didn't work.
The command that redirects the output to .log file will run for more than a minute. Sometimes it will not even run the first iteration and will simply give an empty output.
Can someone please help me understand what is wrong in the script?
shell while-loop stdout
shell while-loop stdout
edited Nov 12 at 5:35
u__
2,572929
asked Oct 11 at 12:05
Nishanth
85
edited Nov 12 at 5:35
u__
2,572929
asked Oct 11 at 12:05
Nishanth
85
edited Nov 12 at 5:35
u__
2,572929
edited Nov 12 at 5:35
u__
2,572929
edited Nov 12 at 5:35
u__
2,572929
2,572929
asked Oct 11 at 12:05
Nishanth
85
asked Oct 11 at 12:05
Nishanth
85
asked Oct 11 at 12:05
Nishanth
85
85
we would need to see an Minimal, Complete, and Verifiable example version of yourclair-container-scan.sh, it's quite possible something is wrong and causing anexitthere. Good luck.
– shellter
Oct 11 at 14:47
I would also recommend doing some debugging on your own. First run your code (all of it) thru shellcheck.net . Then if those fixes don't resolve your problem, addecho "line=$line"andecho "image_name=$image_name"in appropriate places to see what is happening. If that doesn't highlight where the problem is, then addset -xbefore thewhileloop andset +xhave the while loop. You may need to add the same inside of yourclair-container-scan.sh. Good luck.
– shellter
Oct 11 at 14:50
Will you while loop work as expected when you replacesh clair-container-scan.sh $linewithecho "line=${line}."
– Walter A
Oct 11 at 22:03
Consider redirecting the standard input ofclair-container-scan.shfrom/dev/null. If it reads standard input, then your main loop won't get a chance. You could also consider reading from a file descriptor other than standard input with theread -u Ncommand.
– Jonathan Leffler
Oct 12 at 3:12
add a comment |
we would need to see an Minimal, Complete, and Verifiable example version of yourclair-container-scan.sh, it's quite possible something is wrong and causing anexitthere. Good luck.
– shellter
Oct 11 at 14:47
I would also recommend doing some debugging on your own. First run your code (all of it) thru shellcheck.net . Then if those fixes don't resolve your problem, addecho "line=$line"andecho "image_name=$image_name"in appropriate places to see what is happening. If that doesn't highlight where the problem is, then addset -xbefore thewhileloop andset +xhave the while loop. You may need to add the same inside of yourclair-container-scan.sh. Good luck.
– shellter
Oct 11 at 14:50
Will you while loop work as expected when you replacesh clair-container-scan.sh $linewithecho "line=${line}."
– Walter A
Oct 11 at 22:03
Consider redirecting the standard input ofclair-container-scan.shfrom/dev/null. If it reads standard input, then your main loop won't get a chance. You could also consider reading from a file descriptor other than standard input with theread -u Ncommand.
– Jonathan Leffler
Oct 12 at 3:12
we would need to see an Minimal, Complete, and Verifiable example version of your
clair-container-scan.sh, it's quite possible something is wrong and causing an exit there. Good luck.– shellter
Oct 11 at 14:47
we would need to see an Minimal, Complete, and Verifiable example version of your
clair-container-scan.sh, it's quite possible something is wrong and causing an exit there. Good luck.– shellter
Oct 11 at 14:47
I would also recommend doing some debugging on your own. First run your code (all of it) thru shellcheck.net . Then if those fixes don't resolve your problem, add
echo "line=$line" and echo "image_name=$image_name" in appropriate places to see what is happening. If that doesn't highlight where the problem is, then add set -x before the while loop and set +x have the while loop. You may need to add the same inside of your clair-container-scan.sh. Good luck.– shellter
Oct 11 at 14:50
I would also recommend doing some debugging on your own. First run your code (all of it) thru shellcheck.net . Then if those fixes don't resolve your problem, add
echo "line=$line" and echo "image_name=$image_name" in appropriate places to see what is happening. If that doesn't highlight where the problem is, then add set -x before the while loop and set +x have the while loop. You may need to add the same inside of your clair-container-scan.sh. Good luck.– shellter
Oct 11 at 14:50
Will you while loop work as expected when you replace
sh clair-container-scan.sh $line with echo "line=${line}."– Walter A
Oct 11 at 22:03
Will you while loop work as expected when you replace
sh clair-container-scan.sh $line with echo "line=${line}."– Walter A
Oct 11 at 22:03
Consider redirecting the standard input of
clair-container-scan.sh from /dev/null. If it reads standard input, then your main loop won't get a chance. You could also consider reading from a file descriptor other than standard input with the read -u N command.– Jonathan Leffler
Oct 12 at 3:12
Consider redirecting the standard input of
clair-container-scan.sh from /dev/null. If it reads standard input, then your main loop won't get a chance. You could also consider reading from a file descriptor other than standard input with the read -u N command.– Jonathan Leffler
Oct 12 at 3:12
add a comment |
1 Answer
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active
oldest
votes
up vote
0
down vote
accepted
Resolved the issue by using for loop and read array. The problem is actually with lines the while loop read, it has special characters like "/ :"
filename=$1
readarray images < "$filename"
for line in "${images[@]}"
do
echo ""
done
answered Nov 12 at 5:30
Nishanth
85
add a comment |
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1 Answer
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oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
0
down vote
accepted
Resolved the issue by using for loop and read array. The problem is actually with lines the while loop read, it has special characters like "/ :"
filename=$1
readarray images < "$filename"
for line in "${images[@]}"
do
echo ""
done
answered Nov 12 at 5:30
Nishanth
85
add a comment |
up vote
0
down vote
accepted
Resolved the issue by using for loop and read array. The problem is actually with lines the while loop read, it has special characters like "/ :"
filename=$1
readarray images < "$filename"
for line in "${images[@]}"
do
echo ""
done
answered Nov 12 at 5:30
Nishanth
85
add a comment |
up vote
0
down vote
accepted
up vote
0
down vote
accepted
Resolved the issue by using for loop and read array. The problem is actually with lines the while loop read, it has special characters like "/ :"
filename=$1
readarray images < "$filename"
for line in "${images[@]}"
do
echo ""
done
answered Nov 12 at 5:30
Nishanth
85
Resolved the issue by using for loop and read array. The problem is actually with lines the while loop read, it has special characters like "/ :"
filename=$1
readarray images < "$filename"
for line in "${images[@]}"
do
echo ""
done
answered Nov 12 at 5:30
Nishanth
85
answered Nov 12 at 5:30
Nishanth
85
answered Nov 12 at 5:30
Nishanth
85
answered Nov 12 at 5:30
Nishanth
85
85
add a comment |
add a comment |
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we would need to see an Minimal, Complete, and Verifiable example version of your
clair-container-scan.sh, it's quite possible something is wrong and causing anexitthere. Good luck.– shellter
Oct 11 at 14:47
I would also recommend doing some debugging on your own. First run your code (all of it) thru shellcheck.net . Then if those fixes don't resolve your problem, add
echo "line=$line"andecho "image_name=$image_name"in appropriate places to see what is happening. If that doesn't highlight where the problem is, then addset -xbefore thewhileloop andset +xhave the while loop. You may need to add the same inside of yourclair-container-scan.sh. Good luck.– shellter
Oct 11 at 14:50
Will you while loop work as expected when you replace
sh clair-container-scan.sh $linewithecho "line=${line}."– Walter A
Oct 11 at 22:03
Consider redirecting the standard input of
clair-container-scan.shfrom/dev/null. If it reads standard input, then your main loop won't get a chance. You could also consider reading from a file descriptor other than standard input with theread -u Ncommand.– Jonathan Leffler
Oct 12 at 3:12