By Mendel Cooper
This rfile is either an instructional and a reference on shell scripting with Bash. It assumes no past wisdom of scripting or programming, yet progresses swiftly towards an intermediate/advanced point of guideline. The workouts and heavily-commented examples invite energetic reader participation. nonetheless, it's a paintings in growth. The goal is so as to add a lot supplementary fabric in destiny updates to this record, because it evolves right into a finished e-book that fits or surpasses any of the shell scripting manuals in print.
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Additional resources for Advanced bash-scripting guide
This command considers its arguments as comparison expressions or file tests and returns an exit status corresponding to the result of the comparison (0 for true, 1 for false). 02, Bash introduced the [[ ... ]] extended test command, which performs comparisons in a manner more familiar to programmers from other languages. Note that [[ is a keyword, not a command. Bash sees [[ $a −lt $b ]] as a single element, which returns an exit status. The (( ... )) and let ... constructs also return an exit status of 0 if the arithmetic expressions they evaluate expand to a non−zero value.
Updating or adding new shell variables causes the shell to update its environment, and all the shell's child processes (the commands it executes) inherit this environment. The space allotted to the environment is limited. Creating too many environmental variables or ones that use up excessive space may cause problems. 4. */export var&=ZZZZZZZZZZZZZZ/'`" bash$ du bash: /usr/bin/du: Argument list too long (Thank you, S. C. ) If a script sets environmental variables, they need to be "exported", that is, reported to the environment local to the script.
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