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qemu-io: Extended "--cmd" description in usage text 

It's not clear from the usage description that "--cmd" option accepts
its argument as a string, so any special symbols have to be quoted from
the shell.

Updates in usage text:
 - Specified parameter format for "--cmd" option.
 - Added an instruction how to get help for "--cmd" option.

Signed-off-by: Maria Kustova <maria.k@catit.be>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Maria Kustova 2014-03-18 09:59:19 +04:00 committed by Kevin Wolf
parent 6e6507c06b
commit d208cc353a
1 changed files with 6 additions and 3 deletions
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9
qemu-io.c
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@ -193,10 +193,11 @@ static const cmdinfo_t quit_cmd = {
static void usage(const char *name) static void usage(const char *name)
{ {
printf( printf(
"Usage: %s [-h] [-V] [-rsnm] [-c cmd] ... [file]\n" "Usage: %s [-h] [-V] [-rsnm] [-c STRING] ... [file]\n"
"QEMU Disk exerciser\n" "QEMU Disk exerciser\n"
"\n" "\n"
" -c, --cmd command to execute\n" " -c, --cmd STRING execute command with its arguments\n"
" from the given string\n"
" -r, --read-only export read-only\n" " -r, --read-only export read-only\n"
" -s, --snapshot use snapshot file\n" " -s, --snapshot use snapshot file\n"
" -n, --nocache disable host cache\n" " -n, --nocache disable host cache\n"
@ -207,8 +208,10 @@ static void usage(const char *name)
" -T, --trace FILE enable trace events listed in the given file\n" " -T, --trace FILE enable trace events listed in the given file\n"
" -h, --help display this help and exit\n" " -h, --help display this help and exit\n"
" -V, --version output version information and exit\n" " -V, --version output version information and exit\n"
"\n"
"See '%s -c help' for information on available commands."
"\n", "\n",
name); name, name);
} }
static char *get_prompt(void) static char *get_prompt(void)