is it possible to pass conditions that are checked in if clauses (https://tldp.org/LDP/Bash-Beginners-Guide/html/sect_07_01.html) as arguments to a function? The following does not work.
print_message_if_condition_holds() {
local CONDITION="$1"
local MESSAGE="$2"
if $CONDITION; then
echo "$MESSAGE"
fi
}
print_message_if_condition_holds [ 0 -eq 0 ] "Success"
can it be done with somewhat different syntax?
I'm not sure how advisable it is, but you could do it by treating each token as a separate positional parameter. Since conditionals may take varying numbers of tokens ([ -z str ], [ str ], [ n -lt m ] and so on) you can't hard-code for the parameters - but provided there is only a single messaage then you could swap the order and do
print_message_if_condition_holds() {
local message=$1
shift
local condition=("$@")
if "${condition[@]}"; then
echo "$message"
fi
}
print_message_if_condition_holds "Success" [ 0 -eq 0 ]
Somewhat related:
[ 1 -eq 0 ] || [ 0 -eq 0 ]
COND="( $a -eq $b -o $c -ne $d ) -a -n $e", then pass that string to the test or [ command such as if [ "$COND" ].
[ to the function: print_message_if_condition_holds() { local msg=$1; shift; [ "$@" ] && echo "$msg"; } -- then print_message_if_condition_holds "Success" "$a" -eq "$b"