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This is a fairly common type of record, storing a customer s surname, first name, street address, city, state, and ZIP code. For presentation, we can double-space the records in this file by redirecting the contents of the test.dat file through sed, with the G option:
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$ sed G < test.dat Bloggs Joe 24 City Rd Lee Rowe Sakura Yat Sen 72 King St Sarah Akira
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The power of sed lies in its ability to be used with pipe operators; thus, an action can literally be performed in conjunction with many other operations. For example, to insert double spacing and then remove it, simply invoke sed twice with the appropriate commands:
$ sed G Bloggs Lee Rowe Sakura < test.dat | sed 'n;d' Joe 24 City Rd Yat Sen 72 King St Sarah 3454 Capitol St Akira 1 Madison Ave
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If you are printing reports, you ll probably be using line numbering at some point to uniquely identify records. You can generate line numbers dynamically for display by using sed:
$ 1 2 3 4 sed '/./=' test.dat | sed '/./N; s/\n/ /' Bloggs Joe 24 City Rd Richmond Lee Yat Sen 72 King St Amherst MA 01002 Rowe Sarah 3454 Capitol St Los Angeles CA Sakura Akira 1 Madison Ave New York
VA 90074 NY
You could also use nl. For large files, counting the number of lines is often useful. Although you can use the wc command for this purpose, you can also use sed in situations where wc is not available in the PATH environment variable:
$ cat test.dat | sed -n '$=' 4
Part II:
System Essentials
When you re printing databases for display, you might want to have comments and titles left-justified but have all records displayed with two blank spaces before each line. You can achieve this by using sed:
$ cat test.dat | sed 's/^/ /' Bloggs Joe 24 City Rd Richmond Lee Yat Sen 72 King St Amherst MA 01002 Rowe Sarah 3454 Capitol St Los Angeles CA Sakura Akira 1 Madison Ave New York
VA 90074 NY
Imagine that due to some municipal reorganization, all cities currently located in CT were being reassigned to MA. sed would be the perfect tool to identify all instances of CT in the data file and replace them with MA:
$ cat test.dat | sed 's/MA/CT/g' Bloggs Joe 24 City Rd Richmond Lee Yat Sen 72 King St Amherst CT Rowe Sarah 3454 Capitol St Los Angeles Sakura Akira 1 Madison Ave New York
VA 01002 CA NY
23227 90074 10017
If a data file has been entered as a first-in, last-out (FILO) stack, you ll generally be reading records from the file from top to bottom. However, if the data file is to be treated as a last-in, first-out (LIFO) stack, reordering the records from the last to the first would be useful:
$ cat test.dat | sed '1!G;h;$!d' Sakura Akira 1 Madison Ave New York Rowe Sarah 3454 Capitol St Los Angeles Lee Yat Sen 72 King St Amherst MA Bloggs Joe 24 City Rd Richmond
NY CA 01002 VA
10017 90074 23227
Some data-hiding applications require that data be encoded in some way that is nontrivial for another application to detect a file s contents. One way to foil such programs is to reverse the character strings that comprise each record, which you can achieve by using sed:
$ cat test.dat | sed '/\n/!G;s/\(.\)\(.*\n\)/&\2\1/;//D;s/.//' 72232 AV dnomhciR dR ytiC 42 eoJ sggolB 20010 AM tsrehmA tS gniK 27 neS taY eeL 47009 AC selegnA soL tS lotipaC 4543 haraS ewoR 71001 YN kroY weN evA nosidaM 1 arikA arukaS
Some reporting applications might require that the first line of a file be processed before deletion. Although you can use the head command for this purpose, you can also use sed:
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