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Improve bash variable info

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alexandre medeiros
2013-09-22 01:29:05 -03:00
parent c14586e8c3
commit 9d0f731ad5
1 changed files with 14 additions and 0 deletions
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bash.html.markdown
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@@ -36,8 +36,22 @@ VARIABLE = "Some string"
# Using the variable: # Using the variable:
echo $VARIABLE echo $VARIABLE
echo "$VARIABLE" echo "$VARIABLE"
echo '$VARIABLE'
# When you use the variable itself — assign it, export it, or else — you write # 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 $. # 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: # Reading a value from input:
echo "What's your name?" echo "What's your name?"