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Question

In linux, write one-line script to create new directory ktest (in current directory) ONLY if ktest does not already exist. Do it by finishing following code snippet:

ls ktest >& /dev/null [...]

Answer

|| mkdir ktest

^^ note use of || to denote only if command 1 (i.e. ls ktest >& /dev/null) fails, command 2 (i.e. mkdir ktest) runs


Question

In linux, write one-line script to create new directory ktest (in current directory) ONLY if ktest does not already exist. Do it by finishing following code snippet:

ls ktest >& /dev/null [...]

Answer
?

Question

In linux, write one-line script to create new directory ktest (in current directory) ONLY if ktest does not already exist. Do it by finishing following code snippet:

ls ktest >& /dev/null [...]

Answer

|| mkdir ktest

^^ note use of || to denote only if command 1 (i.e. ls ktest >& /dev/null) fails, command 2 (i.e. mkdir ktest) runs

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20. Advanced Shell Scripting
do with the bash shell. 20.1 Lists of Commands The special operator && and || can be used to execute functions in sequence. For instance: grep '^harry:' /etc/passwd || useradd harry The <span>|| means to only execute the second command if the first command returns an error. In the above case, grep will return an exit code of 1 if harry is not in the /etc/passwd file, causing us

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