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| -rw-r--r-- | bash.html.markdown | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/bash.html.markdown b/bash.html.markdown index 41d0669e..81565b6d 100644 --- a/bash.html.markdown +++ b/bash.html.markdown @@ -36,8 +36,22 @@ VARIABLE = "Some string" # Using the variable: echo $VARIABLE echo "$VARIABLE" +echo '$VARIABLE' # When you use the variable itself — assign it, export it, or else — you write # its name without $. If you want to use variable's value, you should use $. +# Note that ' (single quote) won't expand the variables! + +# String substitution in variables +echo ${VARIABLE/Some/A} +# This will substitute the first occurance of "Some" with "A" + +# Bultin variables: +# There are some useful builtin variables, like +echo "Last program return value: $?" +echo "Script's PID: $$" +echo "Number of arguments: $#" +echo "Scripts arguments: $@" +echo "Scripts arguments separeted in different variables: $1 $2..." # Reading a value from input: echo "What's your name?" |