I have a bash script which is running a bunch of python script all with arguments. In order to have a clean code, I wanted to use variables along the scripts
#!/bin/bash
START=0
SCRIPT_PATH="/opt/scripts/"
IP="192.168.1.111"
if [ "$START" = "0" ]; then
printf "%s: Starting\n" "$DATE_TIME"
PORT=1234
TEST_FILE="$SCRIPT_PATH/Test Scripts/test.TXT"
SCRIPT="$SCRIPT_PATH/script1.py"
ARGS="-P $SCRIPT_PATH/script2.py -n 15 -p $PORT -i $IP"
python "$SCRIPT" ${ARGS} -f "${TEST_FILE}" > ./out.log 2>&1 &
fi
This code is actually working but few things I don't understand :
-f "${TEST_FILE}" to the ARGS variable without python blocking on the whitespace and throwing the error: "$SCRIPT_PATH/Test " not foundWhen you wrap quotes around an argument list, the argument vector receives a single argument with everything that is wrapped in quotes and so, the argument parser fails to do its job properly and you have your issue.
Regarding your second question, it is not easy to embed the quotes into the array, because the quotes will be parsed before being stored in the array, and then when you perform the array expansion to run the command, they will be missing and fail. I have tried this several times with no success.
An alternative approach would mean that you modify a little your script to use a custom internal field separator (IFS) to manually tell what should be considered an argument and what not:
#!/bin/bash
START=0
SCRIPT_PATH="/opt/scripts/"
IP="192.168.1.111"
if [ "$START" = "0" ]; then
printf "%s: Starting\n" "$DATE_TIME"
PORT=1234
TEST_FILE="$SCRIPT_PATH/Test Scripts/test.TXT"
SCRIPT="$SCRIPT_PATH/script1.py"
OLD_IFS=$IFS
IFS=';'
ARGS="$SCRIPT;-P;$SCRIPT_PATH/script2.py;-n;15;-p;$PORT;-i;$IP;-f;$TEST_FILE"
python ${ARGS} > ./out.log 2>&1 &
IFS=$OLD_IFS
fi
As you can see, I replace the spaces in ARGS with semicolons. This way, TEST_FILE variable contents will be considered as a single argument for bash and will be properly populated in argument vector. I'm also moving the script to the argument vector for simplicity, otherwise, Python will not get the proper script path and fail, due to this modification we did to IFS.
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