diff options
| -rw-r--r-- | toys/posix/tail.c | 22 |
1 files changed, 17 insertions, 5 deletions
diff --git a/toys/posix/tail.c b/toys/posix/tail.c index e92c0446..41d46338 100644 --- a/toys/posix/tail.c +++ b/toys/posix/tail.c @@ -4,7 +4,7 @@ * * See http://opengroup.org/onlinepubs/9699919799/utilities/tail.html -USE_TAIL(NEWTOY(tail, "fc-n-[-cn]", TOYFLAG_BIN)) +USE_TAIL(NEWTOY(tail, "?fc-n-[-cn]", TOYFLAG_BIN)) config TAIL bool "tail" @@ -17,7 +17,7 @@ config TAIL -n output the last NUMBER lines (default 10), +X counts from start. -c output the last NUMBER bytes, +NUMBER counts from start - -f follow FILE(s), waiting for more data to be appended + #-f follow FILE(s), waiting for more data to be appended [TODO] config TAIL_SEEK bool "tail seek support" @@ -213,10 +213,22 @@ static void do_tail(int fd, char *name) void tail_main(void) { - // if nothing specified, default -n to -10 - if (!(toys.optflags&(FLAG_n|FLAG_c))) TT.lines = -10; + char **args = toys.optargs; - loopfiles(toys.optargs, do_tail); + if (!(toys.optflags&(FLAG_n|FLAG_c))) { + char *arg = *args; + + // handle old "-42" style arguments + if (arg && *arg == '-' && arg[1]) { + TT.lines = atolx(*(args++)); + toys.optc--; + } + + // if nothing specified, default -n to -10 + TT.lines = -10; + } + + loopfiles(args, do_tail); // do -f stuff } |