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Policy PHP Python Web Services Wireless XML You are not logged in. This is only a preview of the full book! Non-members, to begin your membership please subscribe to establish your account. Buy Print Version Members, please log in. Last updated on 11/14/2001 Linux in a Nutshell, 3rd Edition, 2002 O’Reilly < BACK CONTINUE > Index terms contained in this section access mode agetty command apmd command apmd_proxy command ar command arch command architecture type archive files arithmetic bc language arp command (TCP/IP) as command at command atq commands atrm command attributes, file backups badblocks command banner command basename command bash command batch command batch execution at specified date/time bc language bdflush command biff command /bin/echo command bison command blocks, searching for bad blocksize, changing bootpd command (TCP/IP) bootpgw command bootptest command (TCP/IP) breaking text lines buffers writing to disk

Security Alerts O’Reilly Books Latest LAMP Titles: mod_perl Pocket Reference SQL in a Nutshell Network Printing Books by topic: Linux Open Source Security System and Network Administration Unix Web and Internet O’Reilly Network Technologies: ONJava.com ONLamp.com openp2p.com Perl.com XML.com Apache BSD Java Javascript and CSS Linux Mac Mozilla .NET P2P Perl

Sponsored by: Search | Newsletter | Conference | Tech Jobs O’Reilly’s Emerging Technology Conference: May 13-16, 2002 Articles Linux Apache MySQL Perl PHP Python BSD Essentials What is LAMP? The Best of ONLamp.com aboutSQL Big Scary Daemons FreeBSD Basics HTTP Wrangler Linux in the Enterprise Linux Network Administration The Linux Professional Perl P5P Digest Archive PHP Admin Basics PHP Phanatics Python_News Alphabetical Directory of Linux Commands This directory of Linux commands is from Linux in a Nutshell, 3rd Edition. Click on any of the 379 commands below to get a description and list of available options. All links in the command summaries point to the online version of the book on Safari Tech Buy it now Books Online. Read it online znew [options] [files] Uncompress .Z files and recompress them in .gz format. Options -9 Optimal (and slowest) compression method. -f Recompress even if filename.gz already exists. -t Test new .gz files before removing .Z files. -v Verbose mode. -K If the original .Z file is smaller than the .gz file, keep it. -P Pipe data to conversion program. This saves disk space.

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O’Reilly Books Latest LAMP Titles: mod_perl Pocket Reference SQL in a Nutshell Network Printing Books by topic: Linux Open Source Security System and Network Administration Unix Web and Internet O’Reilly Network Technologies: ONJava.com ONLamp.com openp2p.com Perl.com XML.com Apache BSD Java Javascript and CSS Linux Mac Mozilla .NET P2P Perl Policy PHP Python Web Services Wireless

Sponsored by: Search | Newsletter | Conference | Tech Jobs O’Reilly’s Emerging Technology Conference: May 13-16, 2002 Articles Linux Apache MySQL Perl PHP Python BSD Essentials What is LAMP? The Best of ONLamp.com aboutSQL Big Scary Daemons FreeBSD Basics HTTP Wrangler Linux in the Enterprise Linux Network Administration The Linux Professional Perl P5P Digest Archive PHP Admin Basics PHP Phanatics Python_News Security Alerts Alphabetical Directory of Linux Commands This directory of Linux commands is from Linux in a Nutshell, 3rd Edition. Click on any of the 379 commands below to get a description and list of available options. All links in the command summaries point to the online version of the book on Safari Tech Books Online. Buy it now Read it online userdel [option] user System administration command. Delete all entries for user in system account files. Option -r Remove the home directory of user and any files contained in it. Return to: Alphabetical Directory of Linux Commands Sponsored by:

XML Copyright 2000-2002 O’Reilly & Associates, Inc. All Rights Reserved. All trademarks and registered trademarks appearing on the O’Reilly Network are the property of their respective owners. For problems or assistance with this site, email help@oreillynet.com

O’Reilly Books Latest LAMP Titles: mod_perl Pocket Reference SQL in a Nutshell Network Printing Books by topic: Linux Open Source Security System and Network Administration Unix Web and Internet O’Reilly Network Technologies: ONJava.com ONLamp.com openp2p.com Perl.com XML.com Apache BSD Java Javascript and CSS Linux Mac Mozilla .NET P2P Perl Policy PHP Python Web Services Wireless list with no whitespace. -k [dir] Copy default files to user’s home directory. Meaningful only when used with the -m option. Default files are copied from /etc/skel/ unless an alternate dir is specified. -m Make user’s home directory if it does not exist. The default is not to make the home directory. -o Override. Accept a nonunique uid with the -u option. (Probably a bad idea.) -s shell Login shell. -u uid Numerical user ID. The value must be unique unless the -o option is used. The default value is the smallest ID value greater than 99 and greater than every other uid. -D [options] Set or display defaults. If options are specified, set them. If no options are specified, display current defaults. The options are: -b dir Home directory prefix to be used in creating home directories. If the -d option is not used when creating an account, the user name will be appended to dir. -e date Expire date. Requires the use of shadow passwords. -f days Number of days after a password expires to disable an account. Requires the use of shadow passwords. -g group Initial group name or ID number. -s shell Default login shell. Return to: Alphabetical Directory of Linux Commands

Sponsored by: Search | Newsletter | Conference | Tech Jobs O’Reilly’s Emerging Technology Conference: May 13-16, 2002 Articles Linux Apache MySQL Perl PHP Python BSD Essentials What is LAMP? The Best of ONLamp.com aboutSQL Big Scary Daemons FreeBSD Basics HTTP Wrangler Linux in the Enterprise Linux Network Administration The Linux Professional Perl P5P Digest Archive PHP Admin Basics PHP Phanatics Python_News Security Alerts Alphabetical Directory of Linux Commands This directory of Linux commands is from Linux in a Nutshell, 3rd Edition. Click on any of the 379 commands below to get a description and list of available options. All links in the command summaries point to the online version of the book on Safari Tech Books Online. Buy it now Read it online useradd [options] [user] System administration command. Create new user accounts or update default account information. Unless invoked with the -D option, user must be given. useradd will create new entries in system files. Home directories and initial files may also be created as needed. Options -c comment Comment field. -d dir Home directory. The default is to use user as the directory name under the home directory specified with the -D option. -e date Account expiration date. date is in the format MM/DD/YYYY. Twodigit year fields are also accepted. The value is stored as the number of days since January 1, 1970. This option requires the use of shadow passwords. -f days Permanently disable account this many days after the password has expired. A value of -1 disables this feature. This option requires the use of shadow passwords. -g group Initial group name or ID number. If a different default group has not been specified using the -D option, the default group is 1. -G groups Supplementary groups given by name or number in a comma-separated Sponsored by:

XML Copyright 2000-2002 O’Reilly & Associates, Inc. All Rights Reserved. All trademarks and registered trademarks appearing on the O’Reilly Network are the property of their respective owners. For problems or assistance with this site, email help@oreillynet.com