Hi people: I'm making a xfe script to take a given directory as source file, use zenity to get output dir and perform some operations, for example:
#!/bin/bash
OUTPUT_DIR=`zenity --file-selection --directory --filename="$1"`
if [ $? == 0 ]; then
find . -maxdepth 1 -type f -name "*.wav" -exec bash -c 'oggenc -Q "$0" -q 3 "$OUTPUT_DIR/${0%.wav}.ogg"' {} \;
fi
When the script is invoked, oggenc is not executed...any ideas?
Solution : Based on answers bellow, this works as expected:
#!/usr/bin/sh
OUTPUT_DIR=$(zenity --file-selection --directory --filename="$1")
if [ $? = 0 ]; then
export OUTPUT_DIR
find "$1" -maxdepth 1 -type f -name "*.wav" -exec sh -c 'oggenc -Q "$0" -q 3 -o "${OUTPUT_DIR}/$(basename "${0/.wav/.ogg}")"' {} \;
fi
zenity --info --text="Done"
To make the variable $OUTPUT_DIR
available to the child process, add one line:
OUTPUT_DIR=$(zenity --file-selection --directory --filename="$1")
if [ $? = 0 ]; then
export OUTPUT_DIR
find . -maxdepth 1 -type f -name "*.wav" -exec bash -c 'oggenc -Q "$0" -q 3 "$OUTPUT_DIR/${0%.wav}.ogg"' {} \;
fi
Or, slightly simpler:
if OUTPUT_DIR=$(zenity --file-selection --directory --filename="$1"); then
export OUTPUT_DIR
find . -maxdepth 1 -type f -name "*.wav" -exec bash -c 'oggenc -Q "$0" -q 3 "$OUTPUT_DIR/${0%.wav}.ogg"' {} \;
fi
Notes:
The command 'oggenc -Q "$0" -q 3 "$OUTPUT_DIR/${0%.wav}.ogg"'
appears in single-quotes. This means that the variables are not expanded by the parent shell. They are expanded by the child shell. To make it available to the child shell, a variable must be exported.
[ $? == 0 ]
[ $? == 0 ]
works in bash but [ $? = 0 ]
[ $? = 0 ]
will also work and is more portable.
Command substitution can be done with backticks and some old shells only accept backticks. For modern shells, however, the $(...)
has the advantage of improved readability (some fonts don't clearly distinguish back and normal quotes). Also $(...)
can be nested in a clear and sensible way.
I'd prefer to use while
loop over pipelining. Your code may be rewritten in this way
while IFS= read -r -d '' file; do
oggenc -Q "${file}" -q 3 "${OUTPUT_DIR}/$(basename ${file/.wav/.ogg})"
done < <(find . -maxdepth 1 -type f -name "*.wav" -print0)
The reason why your code was not working is that single quotes '
forbids variables expansion so $OUTPUT_DIR
will not expand.
EDIT
-print0
is used in conjunction with IFS=
is to split find
output only on \\0
but not on whitespace in filenames.
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