Advanced bash-scripting guide by Mendel Cooper

By Mendel Cooper

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

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3) tar cf - . '). 4) | Piped to ... 5) ( ... ) a subshell 6) cd /dest/directory Change to the destination directory. 7) && "And-list", as above 8) tar xpvf Unarchive ('x'), preserve ownership and file permissions ('p'), and send verbose messages to stdout ('v'), reading data from stdin ('f' followed by '-'). Note that 'x' is a command, and 'p', 'v', 'f' are options. 28 29 30 31 32 33 34 35 36 37 38 39 40 41 1 2 3 4 5 # # Whew! # More elegant than, but equivalent to: # cd source/directory # tar cf - .

In a test construct, the || operator causes a return of 0 (success) if either of the linked test conditions is true. & Run job in background. A command followed by an & will run in the background. bash$ sleep 10 & [1] 850 [1]+ Done sleep 10 Within a script, commands and even loops may run in the background. Example 3-3. sh for i in 1 2 3 4 5 6 7 8 9 10 # First loop. do echo -n "$i " done & # Run this loop in background. # Will sometimes execute after second loop. echo # This 'echo' sometimes will not display.

Bin/sh. According to Sven Mascheck this is probably a myth. [3] The #! line in a shell script will be the first thing the command interpreter (sh or bash) sees. Since this line begins with a #, it will be correctly interpreted as a comment when the command interpreter finally executes the script. The line has already served its purpose - calling the command interpreter. If, in fact, the script includes an extra #! line, then bash will interpret it as a comment. /bin/bash # This does *not* launch a new script.

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