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journalctl: make the argument to -n optional

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This commit is contained in:
Lennart Poettering 2012-09-21 22:33:02 +02:00
parent f801968466
commit 1705594f59
2 changed files with 21 additions and 14 deletions
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13
man/journalctl.xml
View File

@ -161,11 +161,14 @@
<listitem><para>Controls the number of
journal lines to show, counting from
the most recent ones. Takes a positive
integer argument. In follow mode
defaults to 10, otherwise is unset
thus not limiting how many lines are
shown.</para></listitem>
the most recent ones. The argument is
optional, and if specified is a
positive integer. If not specified and
in follow mode defaults to 10. If this
option is not passed and follow mode
is not enabled, how many lines are
shown is not
limited.</para></listitem>
</varlistentry>
<varlistentry>

22
src/journal/journalctl.c
View File

@ -87,7 +87,7 @@ static int help(void) {
" --no-pager Do not pipe output into a pager\n"
" -a --all Show all fields, including long and unprintable\n"
" -f --follow Follow journal\n"
" -n --lines=INTEGER Journal entries to show\n"
" -n --lines[=INTEGER] Number of journal entries to show\n"
" --no-tail Show all lines, even in follow mode\n"
" -o --output=STRING Change journal output mode (short, short-monotonic,\n"
" verbose, export, json, json-pretty, cat)\n"
@ -133,7 +133,7 @@ static int parse_argv(int argc, char *argv[]) {
{ "follow", no_argument, NULL, 'f' },
{ "output", required_argument, NULL, 'o' },
{ "all", no_argument, NULL, 'a' },
{ "lines", required_argument, NULL, 'n' },
{ "lines", optional_argument, NULL, 'n' },
{ "no-tail", no_argument, NULL, ARG_NO_TAIL },
{ "new-id128", no_argument, NULL, ARG_NEW_ID128 },
{ "quiet", no_argument, NULL, 'q' },
@ -155,7 +155,7 @@ static int parse_argv(int argc, char *argv[]) {
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "hfo:an:qmbD:p:", options, NULL)) >= 0) {
while ((c = getopt_long(argc, argv, "hfo:an::qmbD:p:", options, NULL)) >= 0) {
switch (c) {
@ -178,7 +178,7 @@ static int parse_argv(int argc, char *argv[]) {
break;
case 'o':
arg_output = output_mode_from_string(optarg);
arg_output = output_mode_from_string(optarg);
if (arg_output < 0) {
log_error("Unknown output '%s'.", optarg);
return -EINVAL;
@ -191,11 +191,15 @@ static int parse_argv(int argc, char *argv[]) {
break;
case 'n':
r = safe_atoi(optarg, &arg_lines);
if (r < 0 || arg_lines < 0) {
log_error("Failed to parse lines '%s'", optarg);
return -EINVAL;
}
if (optarg) {
r = safe_atoi(optarg, &arg_lines);
if (r < 0 || arg_lines < 0) {
log_error("Failed to parse lines '%s'", optarg);
return -EINVAL;
}
} else
arg_lines = 10;
break;
case ARG_NO_TAIL: