diff options
Diffstat (limited to 'usage.c')
| -rw-r--r-- | usage.c | 38 |
1 files changed, 38 insertions, 0 deletions
@@ -250,6 +250,44 @@ const char echo_usage[] = ; #endif +#if defined BB_EXPR +const char expr_usage[] = + "expr EXPRESSION\n" +#ifndef BB_FEATURE_TRIVIAL_HELP + "\nPrints the value of EXPRESSION to standard output.\n\n" + "EXPRESSION may be:\n" + "ARG1 | ARG2 ARG1 if it is neither null nor 0, otherwise ARG2\n" + "ARG1 & ARG2 ARG1 if neither argument is null or 0, otherwise 0\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" + "ARG1 + ARG2 arithmetic sum of ARG1 and ARG2\n" + "ARG1 - ARG2 arithmetic difference of ARG1 and ARG2\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" + "STRING : REGEXP anchored pattern match of REGEXP in STRING\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" + "quote TOKEN interpret TOKEN as a string, even if it is a \n" + " keyword like `match' or an operator like `/'\n" + "( EXPRESSION ) value of EXPRESSION\n\n" + "Beware that many operators need to be escaped or quoted for shells.\n" + "Comparisons are arithmetic if both ARGs are numbers, else\n" + "lexicographical. Pattern matches return the string matched between \n" + "\\( and \\) or null; if \\( and \\) are not used, they return the number \n" + "of characters matched or 0.\n" + +#endif + ; +#endif + + #if defined BB_TRUE_FALSE const char false_usage[] = "false\n" |