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Consider the following value of PATH variable: /bin:/usr/local/sbin:/home/joe/bin:/home/joe/test Joe modifies the my_scr.sh script, which is stored in the directory /home/joe/bin then places a copy of my_scr.sh in /home/joe/test. Executing my_scr.sh will:
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The command PATH=$PATH:/home/John does the following:
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Which of the following is NOT a valid option for executing a command that is not in the directories listed in the PATH variable?
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Which command can be used to delete a variable?
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A variable once declared cannot be deleted. True or False?
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Which command can be used to display both local and environment variables?
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The _ command is used to display the value of a specific variable.
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Which of the following is NOT a valid command for variable declaration?
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A new environment variable can be “exported” and assigned a value with a single command. True or False?
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Which of the following is NOT a valid variable name?
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Shell variables are case insensitive. True or False?
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Which of the following is a valid variable assignment?
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Command substitution can be used to insert the output of a command as another command’s argument. True or False?
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A user wants to execute a script called test1_script. What type of permission does she need on the test1_script file?
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The statement if [ -d file ] will be true, if the file:
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