Download Advanced Bash-Scripting Guide by Mendel Cooper PDF

By Mendel Cooper

This can be the total reference at the Borne back shell (bash). quantity 1Volume 2 includes all appendices.

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Sh: Very crude reimplementation of 'grep'. E_BADARGS=65 if [ -z "$1" ] # Check for argument to script. then echo "Usage: `basename $0` pattern" exit $E_BADARGS fi echo for file in * # Traverse all files in $PWD. do output=$(sed -n /"$1"/p $file) # Command substitution. if [ ! -z "$output" ] # What happens if "$output" is not quoted? then echo -n "$file: " echo $output fi # sed -ne "/$1/s|^|${file}: |p" is equivalent to above. html (9 of 19) [7/15/2002 6:33:48 PM] Text Processing Commands done echo exit 0 # # # # Exercises: --------1) Add newlines to output, if more than one match in any given file.

The output of nl is very similar to cat -n, however, by default nl does not list blank lines. Example 12-21. nl: A self-numbering script. /bin/bash # This script echoes itself twice to stdout with its lines numbered. # 'nl' sees this as line 3 since it does not number blank lines. # 'cat -n' sees the above line as number 5. nl `basename $0` echo; echo # Now, let's try it with 'cat -n' cat -n `basename $0` # The difference is that 'cat -n' numbers the blank lines. # Note that 'nl -ba' will also do so.

Bash$ ps ax | grep clock 765 tty1 S 0:00 xclock 901 pts/1 S 0:00 grep clock The -i option causes a case-insensitive search. The -w option matches only whole words. The -l option lists only the files in which matches were found, but not the matching lines. The -r (recursive) option searches files in the current working directory and all subdirectories below it. html (7 of 19) [7/15/2002 6:33:48 PM] Text Processing Commands The -n option lists the matching lines, together with line numbers. txt 2:This is a file containing information about Linux.

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