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string_operations
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h returns the length of the value of the variable as a character string. For example, if filename has ... ositional parameters. echo ${@:2} # Same as above. echo ${*:2:3} # Echoes three posit... n. There are four substitution operators in bash, as shown in the following table. Operator Function ... IX utility basename(1). basename takes a pathname as argument and returns the filename only; it is mea
test
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=4 b=5 # Here "a" and "b" can be treated either as integers or strings. # There is some blurring be... alue. # This state is called "null" (not the same as zero!). if [ -n $string1 ] # string1 has not ... # Wrong result. # Shows $string1 as not null, although it was not initialized. echo ... ood practice to quote it (if [ "$string1" ]). # # As Stephane Chazelas points out, # if [ $string1
 
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