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| author | Andrew Ruder <andrew.ruder@elecsyscorp.com> | 2013-10-22 19:07:34 -0500 |
|---|---|---|
| committer | Tom Rini <trini@ti.com> | 2013-11-08 09:38:24 -0500 |
| commit | 88733e2c65b1b118e6e1a942d62a48ce62a5ea40 (patch) | |
| tree | d34db65ce88b141c2b737a0767084a0899f17719 /README | |
| parent | 8948794a273a6b4925d1acc5788ce804f0ceb410 (diff) | |
| download | blackbird-obmc-uboot-88733e2c65b1b118e6e1a942d62a48ce62a5ea40.tar.gz blackbird-obmc-uboot-88733e2c65b1b118e6e1a942d62a48ce62a5ea40.zip | |
cmd_nvedit.c: Add env exists command
env exists is a way to test (in hush) if an environment variable
exists. A workaround existed using printenv but this new command
doesn't require all the stdout/stderr redirection to prevent
printing information to the screen.
Example:
$ set testexists 1
$ env exists testexists && echo "yes"
yes
$ env exists testexists || echo "no"
$ set testexists
$ env exists testexists && echo "yes"
$ env exists testexists || echo "no"
no
$
Signed-off-by: Andrew Ruder <andrew.ruder@elecsyscorp.com>
Diffstat (limited to 'README')
| -rw-r--r-- | README | 1 |
1 files changed, 1 insertions, 0 deletions
@@ -848,6 +848,7 @@ The following options need to be configured: CONFIG_CMD_ELF * bootelf, bootvx CONFIG_CMD_ENV_CALLBACK * display details about env callbacks CONFIG_CMD_ENV_FLAGS * display details about env flags + CONFIG_CMD_ENV_EXISTS * check existence of env variable CONFIG_CMD_EXPORTENV * export the environment CONFIG_CMD_EXT2 * ext2 command support CONFIG_CMD_EXT4 * ext4 command support |
