Function usage

src/expr.c:226–302

void
usage (int status)
{
  if (status != EXIT_SUCCESS)
    emit_try_help ();
  else
    {
      printf (_("\
Usage: %s EXPRESSION\n\
  or:  %s OPTION\n\
"),
              program_name, program_name);
      putchar ('\n');
      oputs (HELP_OPTION_DESCRIPTION);
      oputs (VERSION_OPTION_DESCRIPTION);
      fputs (_("\
\n\
Print the value of EXPRESSION to standard output.  A blank line below\n\
separates increasing precedence groups.  EXPRESSION may be:\n\
\n\
  ARG1 | ARG2       ARG1 if it is neither null nor 0, otherwise ARG2\n\
\n\
  ARG1 & ARG2       ARG1 if neither argument is null or 0, otherwise 0\n\
"), stdout);
      fputs (_("\
\n\
  ARG1 < ARG2       ARG1 is less than ARG2\n\
  ARG1 <= ARG2      ARG1 is less than or equal to ARG2\n\
  ARG1 = ARG2       ARG1 is equal to ARG2\n\
  ARG1 != ARG2      ARG1 is unequal to ARG2\n\
  ARG1 >= ARG2      ARG1 is greater than or equal to ARG2\n\
  ARG1 > ARG2       ARG1 is greater than ARG2\n\
"), stdout);
      fputs (_("\
\n\
  ARG1 + ARG2       arithmetic sum of ARG1 and ARG2\n\
  ARG1 - ARG2       arithmetic difference of ARG1 and ARG2\n\
"), stdout);
      /* Tell xgettext that the "% A" below is not a printf-style
         format string:  xgettext:no-c-format */
      fputs (_("\
\n\
  ARG1 * ARG2       arithmetic product of ARG1 and ARG2\n\
  ARG1 / ARG2       arithmetic quotient of ARG1 divided by ARG2\n\
  ARG1 % ARG2       arithmetic remainder of ARG1 divided by ARG2\n\
"), stdout);
      fputs (_("\
\n\
  STRING : REGEXP   anchored pattern match of REGEXP in STRING\n\
\n\
  match STRING REGEXP        same as STRING : REGEXP\n\
  substr STRING POS LENGTH   substring of STRING, POS counted from 1\n\
  index STRING CHARS         index in STRING where any CHARS is found, or 0\n\
  length STRING              length of STRING\n\
"), stdout);
      fputs (_("\
  + TOKEN                    interpret TOKEN as a string, even if it is a\n\
                               keyword like 'match' or an operator like '/'\n\