grep --exclude option doesn't always skip named pipes
I have a directory that contains, among other files, 3 named pipes: FIFO, FIFO1, and FIFO11. If I try something like
grep mypattern *
in this directory, grep hangs forever on the named pipes, so I need to exclude them. Unexpectedly,
grep --exclude='FIF*' mypattern *
does not solve the problem; grep still hangs forever. However,
grep -r --exclude='FIF*' mypattern .
does solve the hanging problem (albeit with the undesired side effect of searching all the subdirectories).
I did some testing that shows that grep --exclude ='FIF*' mypattern * works as expected if FIFO etc. are regular files, not named pipes.
Question 1: Why does grep skip --excludes in both cases if they're regular files, and skips --excluded named pipes in the recursive case, but doesn't skip named pipes in the non-recursive case?
Question 2: Is there another way to format the exclusion that will skip these files in all cases?
Question 3: is there a better way to accomplish what I'm after?
grep
asked 4 mins ago
rasras
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I have a directory that contains, among other files, 3 named pipes: FIFO, FIFO1, and FIFO11. If I try something like
grep mypattern *
in this directory, grep hangs forever on the named pipes, so I need to exclude them. Unexpectedly,
grep --exclude='FIF*' mypattern *
does not solve the problem; grep still hangs forever. However,
grep -r --exclude='FIF*' mypattern .
does solve the hanging problem (albeit with the undesired side effect of searching all the subdirectories).
I did some testing that shows that grep --exclude ='FIF*' mypattern * works as expected if FIFO etc. are regular files, not named pipes.
Question 1: Why does grep skip --excludes in both cases if they're regular files, and skips --excluded named pipes in the recursive case, but doesn't skip named pipes in the non-recursive case?
Question 2: Is there another way to format the exclusion that will skip these files in all cases?
Question 3: is there a better way to accomplish what I'm after?
grep
asked 4 mins ago
rasras
1
New contributor
ras is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I have a directory that contains, among other files, 3 named pipes: FIFO, FIFO1, and FIFO11. If I try something like
grep mypattern *
in this directory, grep hangs forever on the named pipes, so I need to exclude them. Unexpectedly,
grep --exclude='FIF*' mypattern *
does not solve the problem; grep still hangs forever. However,
grep -r --exclude='FIF*' mypattern .
does solve the hanging problem (albeit with the undesired side effect of searching all the subdirectories).
I did some testing that shows that grep --exclude ='FIF*' mypattern * works as expected if FIFO etc. are regular files, not named pipes.
Question 1: Why does grep skip --excludes in both cases if they're regular files, and skips --excluded named pipes in the recursive case, but doesn't skip named pipes in the non-recursive case?
Question 2: Is there another way to format the exclusion that will skip these files in all cases?
Question 3: is there a better way to accomplish what I'm after?
grep
asked 4 mins ago
rasras
1
New contributor
ras is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I have a directory that contains, among other files, 3 named pipes: FIFO, FIFO1, and FIFO11. If I try something like
grep mypattern *
in this directory, grep hangs forever on the named pipes, so I need to exclude them. Unexpectedly,
grep --exclude='FIF*' mypattern *
does not solve the problem; grep still hangs forever. However,
grep -r --exclude='FIF*' mypattern .
does solve the hanging problem (albeit with the undesired side effect of searching all the subdirectories).
I did some testing that shows that grep --exclude ='FIF*' mypattern * works as expected if FIFO etc. are regular files, not named pipes.
Question 1: Why does grep skip --excludes in both cases if they're regular files, and skips --excluded named pipes in the recursive case, but doesn't skip named pipes in the non-recursive case?
Question 2: Is there another way to format the exclusion that will skip these files in all cases?
Question 3: is there a better way to accomplish what I'm after?
grep
grep
asked 4 mins ago
rasras
1
New contributor
ras is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 4 mins ago
rasras
1
New contributor
ras is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 4 mins ago
rasras
1
New contributor
ras is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 4 mins ago
rasras
1
asked 4 mins ago
rasras
1
1
New contributor
ras is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
ras is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
ras is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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add a comment |
add a comment |
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