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Code Issues Releases Wiki Activity

Add example for default value

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Denis Arh
2013-12-18 09:37:27 +01:00
parent 1f42f890f6
commit c9a282d08f
1 changed files with 5 additions and 0 deletions
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@@ -5,6 +5,7 @@ contributors:
- ["Max Yankov", "https://github.com/golergka"] - ["Max Yankov", "https://github.com/golergka"]
- ["Darren Lin", "https://github.com/CogBear"] - ["Darren Lin", "https://github.com/CogBear"]
- ["Alexandre Medeiros", "http://alemedeiros.sdf.org"] - ["Alexandre Medeiros", "http://alemedeiros.sdf.org"]
- ["Denis Arh", "https://github.com/darh"]
filename: LearnBash.sh filename: LearnBash.sh
--- ---
@@ -45,6 +46,10 @@ echo '$VARIABLE'
echo ${VARIABLE/Some/A} echo ${VARIABLE/Some/A}
# This will substitute the first occurance of "Some" with "A" # This will substitute the first occurance of "Some" with "A"
# Default value for variable
echo ${FOO:-"DefaultValueIfFOOIsMissingOrEmpty"}
# This works for null (FOO=), empty string (FOO=""), zero (FOO=0) returns 0
# Bultin variables: # Bultin variables:
# There are some useful builtin variables, like # There are some useful builtin variables, like
echo "Last program return value: $?" echo "Last program return value: $?"