I have the following if statement:
if [ "$sourcelast" = "$maxhostlast" ] || [ "$sourcelast" = "$minhostlast" ] || [ "$sourcelast" < "$maxhostlast" ] || [ "$sourcelast" > "$minhostlast" ] ;then ... fi
Now I want that the error message is sent to /dev/null every time an error occur.
How can I do this?
Answer
Before going further, you have to fix your syntax. > and < are shell redirection operators, not comparison operator inside old test [...]. In some shells, you can escape them < and > to archive string comparison, or using new test [[...]].
It sounds like you want numeric comparison in this case, so you should stick with standard operator -lt, -le, -gt, -ge:
if [ "$sourcelast" = "$maxhostlast" ] || [ "$sourcelast" = "$minhostlast" ] || [ "$sourcelast" -lt "$maxhostlast" ] || [ "$sourcelast" -gt "$minhostlast" ] then : "Do something" fi
To redirect all error message from all conditions, you can simply wrap them in a subshell:
if (
[ "$sourcelast" = "$maxhostlast" ] ||
[ "$sourcelast" = "$minhostlast" ] ||
[ "$sourcelast" -lt "$maxhostlast" ] ||
[ "$sourcelast" -gt "$minhostlast" ]
) 2>/dev/null
then
: "Do something"
fi