October 2001
Intermediate to advanced
1040 pages
22h 50m
English
Content preview from UNIX® Shells by Example, Third Edition
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
7.14. Odds and Ends
Some data (e.g., that read in from tape or from a spreadsheet) may not have obvious field separators but may instead have fixed-width columns. To preprocess this type of data, the substr function is useful.
7.14.1. Fixed Fields
In the following example, the fields are of a fixed width, but are not separated by a field separator. The substr function is used to create fields.
Example 7.81.
% cat fixed 031291ax5633(408)987–0124 021589bg2435(415)866–1345 122490de1237(916)933–1234 010187ax3458(408)264–2546 092491bd9923(415)134–8900 112990bg4567(803)234–1456 070489qr3455(415)899–1426 % nawk '{printf substr($0,1,6)" ";printf substr($0,7,6)" ";\ print substr($0,13,length)}' fixed 031291 ax5633 (408)987–0124 021589 bg2435 (415)866–1345 ... |
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.