Download Advanced Bash−Scripting Guide. An in−depth exploration of by Cooper M. PDF

By Cooper M.

This instructional assumes no past wisdom of scripting or programming, yet progresses speedily towards an intermediate/advanced point of guideline ...all the whereas sneaking in little snippets of UNIX knowledge and lore. It serves as a textbook, a handbook for self-study, and a reference and resource of data on shell scripting suggestions. The workouts and heavily-commented examples invite energetic reader participation, lower than the basis that the single strategy to fairly study scripting is to put in writing scripts.

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Additional info for Advanced Bash−Scripting Guide. An in−depth exploration of the gentle art of shell scripting

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Lskdf echo $? # Unrecognized command. # Non−zero exit status returned because command failed to execute. echo exit 113 # Will return 113 to shell. " after script terminates. # By convention, an 'exit 0' indicates success, #+ while a non−zero exit value means an error or anomalous condition. $? is especially useful for testing the result of a command in a script (see Example 12−27 and Example 12−13). , the logical "not" qualifier, reverses the outcome of a test or command, and this affects its exit status.

What would happen if it were removed? # Try removing it, then rerunning the script. 2. File test operators Returns true if... ) −p file is a pipe −h file is a symbolic link −L file is a symbolic link −S file is a socket −t file (descriptor) is associated with a terminal device This test option may be used to check whether the stdin ([ −t 0 ]) or stdout ([ −t 1 ]) in a given script is a terminal. −r file has read permission (for the user running the test) −w file has write permission (for the user running the test) −x file has execute permission (for the user running the test) −g set−group−id (sgid) flag set on file or directory Chapter 7.

Chapter 5. Quoting 35 Advanced Bash−Scripting Guide Elements of a string assigned to a variable may be escaped, but the escape character alone may not be assigned to a variable. sh: : command not found # A "naked" escape cannot safely be assigned to a variable. # # What actually happens here is that the "\" escapes the newline and #+ the effect is variable=echo "$variable" #+ invalid variable assignment variable=\ 23skidoo echo "$variable" # 23skidoo # This works, since the second line #+ is a valid variable assignment.

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