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authorAndrew Ruder <andrew.ruder@elecsyscorp.com>2013-10-22 19:07:34 -0500
committerTom Rini <trini@ti.com>2013-11-08 09:38:24 -0500
commit88733e2c65b1b118e6e1a942d62a48ce62a5ea40 (patch)
treed34db65ce88b141c2b737a0767084a0899f17719 /README
parent8948794a273a6b4925d1acc5788ce804f0ceb410 (diff)
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--README1
1 files changed, 1 insertions, 0 deletions
diff --git a/README b/README
index 91c3ac0fa72..a4a450efeec 100644
--- a/README
+++ b/README
@@ -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