NEVERMIND, IT'S ON 'INFO EXPR'. Could you folks please add it to 'man expr'?
XXX Greetings, I'm not sure if this is the intended UNIX/POSIX behaviour, but on: < expr substr a 1 2 , I get:
a
, which is right, but on: < expr substr + 1 2 I get:
expr: syntax error: missing argument after ‘2’
On expr "$line_of_text" 1 2, this error is thrown if the line is a simple '+'. A real-world scenario is getting the first character of each line in bulk, crashing if the line is '+'.
< expr --version
expr (GNU coreutils) 8.32
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