Bash test operators, if, case, loops, functions, arrays, here-documents, traps and set options.
40 cards · basic cards · AI-written, checked twice. Edit anything.
- What does [ -z STRING ] test?
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Whether STRING is empty- What does [ -n STRING ] test?
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Whether STRING is non-empty- What does [ -f FILE ] test?
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Whether FILE is a regular file- What does [ -d DIR ] test?
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Whether DIR is a directory- What does [ -e FILE ] test?
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Whether FILE or directory exists- What does [ -r FILE ] test?
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Whether FILE is readable- What does [ $a -eq $b ] test?
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Whether $a equals $b numerically- What does [ $a -lt $b ] test?
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Whether $a is less than $b- What does [ $a -gt $b ] test?
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Whether $a is greater than $b- What does [ $a -ge $b ] test?
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Whether $a is greater than or equal to $b- What does [ "$a" = "$b" ] test?
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Whether strings are equal- What does [ condition1 -a condition2 ] test?
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Whether both conditions are true (AND)- What does [ condition1 -o condition2 ] test?
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Whether either condition is true (OR)- When should you use [[ ]] instead of [ ]?
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For regex matching, to avoid word splitting, or easier quoting of variables- How do you write if with an else clause?
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if CONDITION; then COMMANDS; else COMMANDS; fi
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