See reader questions & answers on this topic! - Help others by sharing your knowledge
These seven articles contain the answers to some Frequently Asked Questions often seen in comp.unix.questions and comp.unix.shell. Please don't ask these questions again, they've been answered plenty of times already - and please don't flame someone just because they may not have read this particular posting. Thank you. This collection of documents is Copyright (c) 1994, Ted Timar, except Part 6, which is Copyright (c) 1994, Pierre Lewis and Ted Timar. All rights reserved. Permission to distribute the collection is hereby granted providing that distribution is electronic, no money is involved, reasonable attempts are made to use the latest version and all credits and this copyright notice are maintained. Other requests for distribution will be considered. All reasonable requests will be granted. All information here has been contributed with good intentions, but none of it is guaranteed either by the contributors or myself to be accurate. The users of this information take all responsibility for any damage that may occur. Many FAQs, including this one, are available on the archive site rtfm.mit.edu in the directory pub/usenet/news.answers. The name under which a FAQ is archived appears in the "Archive-Name:" line at the top of the article. This FAQ is archived as "unix-faq/faq/part[1-7]". These articles are divided approximately as follows: 1.*) General questions. 2.*) Relatively basic questions, likely to be asked by beginners. 3.*) Intermediate questions. 4.*) Advanced questions, likely to be asked by people who thought they already knew all of the answers. 5.*) Questions pertaining to the various shells, and the differences. 6.*) An overview of Unix variants. 7.*) An comparison of configuration management systems (RCS, SCCS). This article includes answers to: 3.1) How do I find the creation time of a file? 3.2) How do I use "rsh" without having the rsh hang around until the remote command has completed? 3.3) How do I truncate a file? 3.4) Why doesn't find's "{}" symbol do what I want? 3.5) How do I set the permissions on a symbolic link? 3.6) How do I "undelete" a file? 3.7) How can a process detect if it's running in the background? 3.8) Why doesn't redirecting a loop work as intended? (Bourne shell) 3.9) How do I run 'passwd', 'ftp', 'telnet', 'tip' and other interactive programs from a shell script or in the background? 3.10) How do I find the process ID of a program with a particular name from inside a shell script or C program? 3.11) How do I check the exit status of a remote command executed via "rsh" ? 3.12) Is it possible to pass shell variable settings into an awk program? 3.13) How do I get rid of zombie processes that persevere? 3.14) How do I get lines from a pipe as they are written instead of only in larger blocks? 3.15) How do I get the date into a filename? 3.16) Why do some scripts start with #! ... ? If you're looking for the answer to, say, question 3.5, and want to skip everything else, you can search ahead for the regular expression "^3.5)". While these are all legitimate questions, they seem to crop up in comp.unix.questions or comp.unix.shell on an annual basis, usually followed by plenty of replies (only some of which are correct) and then a period of griping about how the same questions keep coming up. You may also like to read the monthly article "Answers to Frequently Asked Questions" in the newsgroup "news.announce.newusers", which will tell you what "UNIX" stands for. With the variety of Unix systems in the world, it's hard to guarantee that these answers will work everywhere. Read your local manual pages before trying anything suggested here. If you have suggestions or corrections for any of these answers, please send them to to tmatimar@isgtec.com. User Contributions:Comment about this article, ask questions, or add new information about this topic:Section Contents
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