What is the way to do multilevel if-else's in shell scripting?
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Using set -A write a script to print the output of the ls command in 5 columns with two spaces between each column. Pretend that ls does not have multicolumn output.
Determine the output of the following command: [ -z “” ] && echo 0 || echo 1
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what is the meaning of First line of shell script ,what is meaning of #! pleas explain brifly
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