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Rev reverses each line of a file, and outputs to stdout. This is not the same effect as tac, as it preserves the order of the lines, but flips each one around. txt This is line 1. This is line 2. txt This is line 2. This is line 1. 2 enil si sihT cp This is the file copy command. cp file1 file2 copies file1 to file2, overwriting file2 if it already exists (see Example 12-5). Particularly useful are the -a archive flag (for copying an entire directory tree) and the -r and -R recursive flags. mv This is the file move command.

C. Using wc to total up the size of all the files whose names begin with letters in the range d - h bash$ wc [d-h]* | grep total | awk '{print $3}' 71832 Using wc to count the instances of the word "Linux" in the main source file for this book. sgml | wc -l 50 See also Example 12-30 and Example 16-7. Certain commands include some of the functionality of wc as options. | grep foo | wc -l # This frequently used construct can be more concisely rendered. | grep -c foo # Just use the "-c" (or "--count") option of grep.

2. 3. 4. 5. 6. 7. 8. 9. Miscellaneous Commands Standard UNIX commands make shell scripts more versatile. The power of scripts comes from coupling system commands and shell directives with simple programming constructs. html [7/15/2002 6:33:52 PM] Home Up Next Basic Commands Job Control Commands Advanced Bash-Scripting Guide: Chapter 11. 1. Job Control Commands Certain of the following job control commands take a "job identifier" as an argument. See the table at end of the chapter. jobs Lists the jobs running in the background, giving the job number.

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