diff options
Diffstat (limited to 'coreutils/expr.c')
| -rw-r--r-- | coreutils/expr.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/coreutils/expr.c b/coreutils/expr.c index 04d783f2b..24e75b556 100644 --- a/coreutils/expr.c +++ b/coreutils/expr.c @@ -25,6 +25,41 @@ /* no getopt needed */ +//usage:#define expr_trivial_usage +//usage: "EXPRESSION" +//usage:#define expr_full_usage "\n\n" +//usage: "Print the value of EXPRESSION to stdout\n" +//usage: "\n" +//usage: "EXPRESSION may be:\n" +//usage: " ARG1 | ARG2 ARG1 if it is neither null nor 0, otherwise ARG2\n" +//usage: " ARG1 & ARG2 ARG1 if neither argument is null or 0, otherwise 0\n" +//usage: " ARG1 < ARG2 1 if ARG1 is less than ARG2, else 0. Similarly:\n" +//usage: " ARG1 <= ARG2\n" +//usage: " ARG1 = ARG2\n" +//usage: " ARG1 != ARG2\n" +//usage: " ARG1 >= ARG2\n" +//usage: " ARG1 > ARG2\n" +//usage: " ARG1 + ARG2 Sum of ARG1 and ARG2. Similarly:\n" +//usage: " ARG1 - ARG2\n" +//usage: " ARG1 * ARG2\n" +//usage: " ARG1 / ARG2\n" +//usage: " ARG1 % ARG2\n" +//usage: " STRING : REGEXP Anchored pattern match of REGEXP in STRING\n" +//usage: " match STRING REGEXP Same as STRING : REGEXP\n" +//usage: " substr STRING POS LENGTH Substring of STRING, POS counted from 1\n" +//usage: " index STRING CHARS Index in STRING where any CHARS is found, or 0\n" +//usage: " length STRING Length of STRING\n" +//usage: " quote TOKEN Interpret TOKEN as a string, even if\n" +//usage: " it is a keyword like 'match' or an\n" +//usage: " operator like '/'\n" +//usage: " (EXPRESSION) Value of EXPRESSION\n" +//usage: "\n" +//usage: "Beware that many operators need to be escaped or quoted for shells.\n" +//usage: "Comparisons are arithmetic if both ARGs are numbers, else\n" +//usage: "lexicographical. Pattern matches return the string matched between\n" +//usage: "\\( and \\) or null; if \\( and \\) are not used, they return the number\n" +//usage: "of characters matched or 0." + #include "libbb.h" #include "xregex.h" |