Download Advanced Bash-Scripting Guide by Mendel Cooper PDF

By Mendel Cooper

This is often the entire reference at the Borne back shell (bash). quantity 1Volume 2 comprises all appendices.

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2. File test operators Returns true if... -e file exists -a file exists This is identical in effect to -e. It has been "deprecated," [28] and its use is discouraged. -f file is a regular file (not a directory or device file) -s file is not zero size Chapter 7. " fi # /dev/sda2 is a block device. -c file is a character device -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.

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 15-35 and Example 15-20). , the logical not qualifier, reverses the outcome of a test or command, and this affects its exit status. Example 6-2.

F file is a regular file (not a directory or device file) -s file is not zero size Chapter 7. " fi # /dev/sda2 is a block device. -c file is a character device -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 If a directory has the sgid flag set, then a file created within that directory belongs to the group that owns the directory, not necessarily to the group of the user who created the file.

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