Basic bash shell scripting concepts including variables, loops, and conditionals.
40 cards · basic cards · AI-written, checked twice. Edit anything.
- How do you declare and assign a variable in bash?
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VARIABLE_NAME=value (no spaces around the equals sign)- What is the syntax to reference a variable's value in bash?
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$VARIABLE_NAME or ${VARIABLE_NAME}- What command exports a variable so it is available to child processes?
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export VARIABLE_NAME- How do you assign the result of a command to a variable?
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VARIABLE=$(command) or VARIABLE=`command`- What is the difference between single quotes and double quotes in bash?
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Double quotes allow variable expansion and command substitution; single quotes treat everything literally- What does the read command do in a bash script?
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Reads input from the user and stores it in a variable- What is the basic structure of an if statement in bash?
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if [ condition ]; then commands; fi- How do you test if a file exists in an if statement?
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if [ -f /path/to/file ]; then- How do you test if a directory exists in an if statement?
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if [ -d /path/to/directory ]; then- What does the -z flag test for in a condition?
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Tests if a string is empty (zero length)- What does the -n flag test for in a condition?
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Tests if a string is not empty (has length)- How do you compare two numbers in an if statement?
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Use -eq, -ne, -lt, -le, -gt, or -ge inside brackets- What is the syntax for an if-else statement in bash?
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if [ condition ]; then commands; else commands; fi- What is the syntax for an if-elif-else statement in bash?
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if [ condition1 ]; then commands; elif [ condition2 ]; then commands; else commands; fi- What is the basic structure of a for loop in bash?
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for variable in list; do commands; done
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