Generating Reports with awk


Generating Reports with awk

Back in Chapter 6, we showed you how to edit delimited files with awk, which is cool because it lets you extract specific pieces of information, such as names and phone numbers, from delimited files. As shown in Code Listing 17.4, you can also use awk to generate reports. We start with the information from an ls -la command, and then use awk to generate a report about who owns what

Code Listing 17.4. Use awk to generate quick reports.

[ejr@hobbes /home]$  ls -la | awk '{print  $9 " owned by "   $3 } END { print NR "  Total Files } '  owned by . owned by root .. owned by root admin owned by admin anyone owned by anyone asr owned by asr awr owned by awr bash owned by bash csh owned by csh deb owned by deb debray owned by debray ejr owned by ejr ejray owned by ejray ftp owned by root httpd owned by httpd lost+found owned by root merrilee owned by merrilee oldstuff owned by 1000 pcguest owned by pcguest raycomm owned by pcguest samba owned by root shared owned by root 22 Total Files [ejr@hobbes /home]$ 

To Generate Reports with awk:

  • ls -la | awk '{print $9 " owned by "  $3 } END { print NR "  Total Files }' 

    Whew! In general, pipe ls -la to the long-winded awk command. (Yes, this is the origin of awkward.) awk then prints the ninth field ($9), the words "owned by," then the third field ($3), and at the end of the output, the total number of records processed (print NR " Total Files"). Code Listing 17.4 shows the printed report.

Tip

  • Remember that you could embed awk scripts in a shell script, as with the previous sed example, if it's something you'll use frequently.





Unix(c) Visual Quickstart Guide
UNIX, Third Edition
ISBN: 0321442458
EAN: 2147483647
Year: 2006
Pages: 251

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