Bash: Comparing names using xargs and if statement
I have a folder were if .wav files are uploaded. A progress is triggered to convert the file. This has to be done recursively.
I use inotifywait to start the process if a file is added or changed, Then I want to compare the file extension using an if statement.
However, rather than comparing the value of {} it tries to call a function with the name of the string replaced by {}. This is probably an issue of my if condition.
My pipeline is here:
inotifywait -mrq -e create -e moved_to --format '%f' ./ | xargs -I {} bash -c "if '{}' =~ *.wav ; then echo {} ; fi"
How should I compare the extension of the string stored in {}?
bash xargs
asked Nov 22 '18 at 20:30
Thomas van der meulenThomas van der meulen
32
add a comment |
I have a folder were if .wav files are uploaded. A progress is triggered to convert the file. This has to be done recursively.
I use inotifywait to start the process if a file is added or changed, Then I want to compare the file extension using an if statement.
However, rather than comparing the value of {} it tries to call a function with the name of the string replaced by {}. This is probably an issue of my if condition.
My pipeline is here:
inotifywait -mrq -e create -e moved_to --format '%f' ./ | xargs -I {} bash -c "if '{}' =~ *.wav ; then echo {} ; fi"
How should I compare the extension of the string stored in {}?
bash xargs
asked Nov 22 '18 at 20:30
Thomas van der meulenThomas van der meulen
32
add a comment |
I have a folder were if .wav files are uploaded. A progress is triggered to convert the file. This has to be done recursively.
I use inotifywait to start the process if a file is added or changed, Then I want to compare the file extension using an if statement.
However, rather than comparing the value of {} it tries to call a function with the name of the string replaced by {}. This is probably an issue of my if condition.
My pipeline is here:
inotifywait -mrq -e create -e moved_to --format '%f' ./ | xargs -I {} bash -c "if '{}' =~ *.wav ; then echo {} ; fi"
How should I compare the extension of the string stored in {}?
bash xargs
asked Nov 22 '18 at 20:30
Thomas van der meulenThomas van der meulen
32
I have a folder were if .wav files are uploaded. A progress is triggered to convert the file. This has to be done recursively.
I use inotifywait to start the process if a file is added or changed, Then I want to compare the file extension using an if statement.
However, rather than comparing the value of {} it tries to call a function with the name of the string replaced by {}. This is probably an issue of my if condition.
My pipeline is here:
inotifywait -mrq -e create -e moved_to --format '%f' ./ | xargs -I {} bash -c "if '{}' =~ *.wav ; then echo {} ; fi"
How should I compare the extension of the string stored in {}?
bash xargs
bash xargs
asked Nov 22 '18 at 20:30
Thomas van der meulenThomas van der meulen
32
asked Nov 22 '18 at 20:30
Thomas van der meulenThomas van der meulen
32
asked Nov 22 '18 at 20:30
Thomas van der meulenThomas van der meulen
32
asked Nov 22 '18 at 20:30
Thomas van der meulenThomas van der meulen
32
asked Nov 22 '18 at 20:30
Thomas van der meulenThomas van der meulen
32
32
add a comment |
add a comment |
2 Answers
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active
oldest
votes
The two main problems are
- You forgot the braces.
ifitself can only check the exit status of the following command andsomefile =~ *.wavis generally not a command, but[[ ... =~ ... ]]is.
=~uses extended regexes which are a bit different from globs. To match all files ending in literally.wavyou have to write.*.wav$.
inotifywait -mrq -e create -e moved_to --format '%f' ./ |
xargs -I {} bash -c "if [[ '{}' =~ .*.wav$ ]]; then echo {}; fi"
However this command might only work for simple file names without special symbols. For instance, it breaks if there is a single ' inside the file name. It would be safer to write
... | xargs -I {} bash -c 'if [[ "$1" =~ .*.wav$ ]]; then printf %s\n "$1"; fi' -- {}
You could also use the simple and faster alternative
... | grep -E '.wav$'
answered Nov 22 '18 at 22:06
SocowiSocowi
7,1862927
add a comment |
If you intention is to filter by certain extension, take a look at https://unix.stackexchange.com/questions/323901/how-to-use-inotifywait-to-watch-a-directory-for-creation-of-files-of-a-specific
Of if you have more complicated logic to handle different file extensions, you can write your code as
inotifywait -mrq -e create -e moved_to --format '%f' ./ | while read line; do
fullname=$(basename -- $line)
extension=${fullname##*.}
filename=${fullname%.*}
echo "fullname=$fullname"
echo "filename=$filename"
echo "extension=$extension"
# now you can do more things with either $filename or $extension
if [ "$extension" == "wav" ]; then
echo "to process $fullname"
fi
done
answered Nov 22 '18 at 22:25
Rico ChenRico Chen
741511
add a comment |
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2 Answers
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active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
The two main problems are
- You forgot the braces.
ifitself can only check the exit status of the following command andsomefile =~ *.wavis generally not a command, but[[ ... =~ ... ]]is.
=~uses extended regexes which are a bit different from globs. To match all files ending in literally.wavyou have to write.*.wav$.
inotifywait -mrq -e create -e moved_to --format '%f' ./ |
xargs -I {} bash -c "if [[ '{}' =~ .*.wav$ ]]; then echo {}; fi"
However this command might only work for simple file names without special symbols. For instance, it breaks if there is a single ' inside the file name. It would be safer to write
... | xargs -I {} bash -c 'if [[ "$1" =~ .*.wav$ ]]; then printf %s\n "$1"; fi' -- {}
You could also use the simple and faster alternative
... | grep -E '.wav$'
answered Nov 22 '18 at 22:06
SocowiSocowi
7,1862927
add a comment |
The two main problems are
- You forgot the braces.
ifitself can only check the exit status of the following command andsomefile =~ *.wavis generally not a command, but[[ ... =~ ... ]]is.
=~uses extended regexes which are a bit different from globs. To match all files ending in literally.wavyou have to write.*.wav$.
inotifywait -mrq -e create -e moved_to --format '%f' ./ |
xargs -I {} bash -c "if [[ '{}' =~ .*.wav$ ]]; then echo {}; fi"
However this command might only work for simple file names without special symbols. For instance, it breaks if there is a single ' inside the file name. It would be safer to write
... | xargs -I {} bash -c 'if [[ "$1" =~ .*.wav$ ]]; then printf %s\n "$1"; fi' -- {}
You could also use the simple and faster alternative
... | grep -E '.wav$'
answered Nov 22 '18 at 22:06
SocowiSocowi
7,1862927
add a comment |
The two main problems are
- You forgot the braces.
ifitself can only check the exit status of the following command andsomefile =~ *.wavis generally not a command, but[[ ... =~ ... ]]is.
=~uses extended regexes which are a bit different from globs. To match all files ending in literally.wavyou have to write.*.wav$.
inotifywait -mrq -e create -e moved_to --format '%f' ./ |
xargs -I {} bash -c "if [[ '{}' =~ .*.wav$ ]]; then echo {}; fi"
However this command might only work for simple file names without special symbols. For instance, it breaks if there is a single ' inside the file name. It would be safer to write
... | xargs -I {} bash -c 'if [[ "$1" =~ .*.wav$ ]]; then printf %s\n "$1"; fi' -- {}
You could also use the simple and faster alternative
... | grep -E '.wav$'
answered Nov 22 '18 at 22:06
SocowiSocowi
7,1862927
The two main problems are
- You forgot the braces.
ifitself can only check the exit status of the following command andsomefile =~ *.wavis generally not a command, but[[ ... =~ ... ]]is.
=~uses extended regexes which are a bit different from globs. To match all files ending in literally.wavyou have to write.*.wav$.
inotifywait -mrq -e create -e moved_to --format '%f' ./ |
xargs -I {} bash -c "if [[ '{}' =~ .*.wav$ ]]; then echo {}; fi"
However this command might only work for simple file names without special symbols. For instance, it breaks if there is a single ' inside the file name. It would be safer to write
... | xargs -I {} bash -c 'if [[ "$1" =~ .*.wav$ ]]; then printf %s\n "$1"; fi' -- {}
You could also use the simple and faster alternative
... | grep -E '.wav$'
answered Nov 22 '18 at 22:06
SocowiSocowi
7,1862927
edited Nov 22 '18 at 22:18
answered Nov 22 '18 at 22:06
SocowiSocowi
7,1862927
answered Nov 22 '18 at 22:06
SocowiSocowi
7,1862927
answered Nov 22 '18 at 22:06
SocowiSocowi
7,1862927
7,1862927
add a comment |
add a comment |
If you intention is to filter by certain extension, take a look at https://unix.stackexchange.com/questions/323901/how-to-use-inotifywait-to-watch-a-directory-for-creation-of-files-of-a-specific
Of if you have more complicated logic to handle different file extensions, you can write your code as
inotifywait -mrq -e create -e moved_to --format '%f' ./ | while read line; do
fullname=$(basename -- $line)
extension=${fullname##*.}
filename=${fullname%.*}
echo "fullname=$fullname"
echo "filename=$filename"
echo "extension=$extension"
# now you can do more things with either $filename or $extension
if [ "$extension" == "wav" ]; then
echo "to process $fullname"
fi
done
answered Nov 22 '18 at 22:25
Rico ChenRico Chen
741511
add a comment |
If you intention is to filter by certain extension, take a look at https://unix.stackexchange.com/questions/323901/how-to-use-inotifywait-to-watch-a-directory-for-creation-of-files-of-a-specific
Of if you have more complicated logic to handle different file extensions, you can write your code as
inotifywait -mrq -e create -e moved_to --format '%f' ./ | while read line; do
fullname=$(basename -- $line)
extension=${fullname##*.}
filename=${fullname%.*}
echo "fullname=$fullname"
echo "filename=$filename"
echo "extension=$extension"
# now you can do more things with either $filename or $extension
if [ "$extension" == "wav" ]; then
echo "to process $fullname"
fi
done
answered Nov 22 '18 at 22:25
Rico ChenRico Chen
741511
add a comment |
If you intention is to filter by certain extension, take a look at https://unix.stackexchange.com/questions/323901/how-to-use-inotifywait-to-watch-a-directory-for-creation-of-files-of-a-specific
Of if you have more complicated logic to handle different file extensions, you can write your code as
inotifywait -mrq -e create -e moved_to --format '%f' ./ | while read line; do
fullname=$(basename -- $line)
extension=${fullname##*.}
filename=${fullname%.*}
echo "fullname=$fullname"
echo "filename=$filename"
echo "extension=$extension"
# now you can do more things with either $filename or $extension
if [ "$extension" == "wav" ]; then
echo "to process $fullname"
fi
done
answered Nov 22 '18 at 22:25
Rico ChenRico Chen
741511
If you intention is to filter by certain extension, take a look at https://unix.stackexchange.com/questions/323901/how-to-use-inotifywait-to-watch-a-directory-for-creation-of-files-of-a-specific
Of if you have more complicated logic to handle different file extensions, you can write your code as
inotifywait -mrq -e create -e moved_to --format '%f' ./ | while read line; do
fullname=$(basename -- $line)
extension=${fullname##*.}
filename=${fullname%.*}
echo "fullname=$fullname"
echo "filename=$filename"
echo "extension=$extension"
# now you can do more things with either $filename or $extension
if [ "$extension" == "wav" ]; then
echo "to process $fullname"
fi
done
answered Nov 22 '18 at 22:25
Rico ChenRico Chen
741511
answered Nov 22 '18 at 22:25
Rico ChenRico Chen
741511
answered Nov 22 '18 at 22:25
Rico ChenRico Chen
741511
answered Nov 22 '18 at 22:25
Rico ChenRico Chen
741511
741511
add a comment |
add a comment |
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