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XML for (expr1;rel-expr;expr2) {statements} Similar to while; for example, to print the first 10 multiples of 5, you could type: for(i=1; i<=10; i++) i*5 GNU bf does not require three arguments to for. A missing argument 1 or 3 means that those expressions will never be evaluated. A missing argument 2 evaluates to the value 1. break Terminate a while or for statement. print list GNU extension. It provides an alternate means of output. list consists of a series of comma-separated strings and expressions; print displays these entities in the order of the list. It does not print a newline when it terminates. Expressions are evaluated, printed, and assigned to the special variable last. Strings (which may contain special characters, i.e., characters beginning with ) are simply printed. Special characters can be: a Alert or bell b Backspace f Form feed n Newline r Carriage return q Double quote t Tab Backslash continue
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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 same program you may name a variable, an array, and a function using the same letter. The following identifiers would not conflict: x Variable x. x[i] Element i of array x. i can range from 0 to 2047 and can also be an expression. x(y,z) Call function x with parameters y and z. Input-output keywords ibase, obase, scale, and last store a value. Typing them on a line by themselves displays their current value. You can also change their values through assignment. The letters A-F are treated as digits whose values are 10-15. ibase = n Numbers that are input (e.g., typed) are read as base n (default is 10). obase = n Numbers that are displayed are in base n (default is 10). Note: Once ibase has been changed from 10, use A to restore ibase or obase to decimal. scale = n Display computations using n decimal places (default is 0, meaning that results are truncated to integers). scale is normally used only for base-10 computations. last Value of last printed number. Statement keywords A semicolon or a newline separates one statement from another. Curly braces are needed when grouping multiple statements. if (rel-expr) {statements} [else {statements}] Do one or more statements if relational expression rel-expr is true. Otherwise, do nothing, or if else (an extension) is specified, do alternative statements. For example: if(x==y) {i = i + 1} else {i = i - 1} while (rel-expr) {statements} Repeat one or more statements while rel-expr is true; for example: while(i>0) {p = p*n; q = a/b; i = i-1}
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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 bc [options] [files] bc is a language (and compiler) whose syntax resembles that of C, but with unlimited-precision arithmetic. bc consists of identifiers, keywords, and symbols, which are briefly described in the following entries. Examples are given at the end. Interactively perform arbitrary-precision arithmetic or convert numbers from one base to another. Input can be taken from files or read from the standard input. To exit, type quit or EOF. Options -l, –mathlib Make functions from the math library available. -s, –standard Ignore all extensions, and process exactly as in POSIX. -w, –warn When extensions to POSIX bc are used, print a warning. -q, –quiet Do not display welcome message. -v, –version Print version number. Identifiers An identifier is a series of one or more characters. It must begin with a lowercase letter but may also contain digits and underscores. No uppercase letters are allowed. Identifiers are used as names for variables, arrays, and functions. Variables normally store arbitrary-precision numbers. Within the Sponsored by:
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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
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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
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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 bash [options] [file [arguments;]] sh [options] [file [arguments]] Standard Linux shell, a command interpreter into which all other commands are entered. For more information, see Chapter 7. Return to: Alphabetical Directory of Linux Commands Sponsored by:
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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
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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
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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 batch [options] [time] Execute commands entered on standard input. If time is omitted, execute them when the system load permits (when the load average falls below 0.8). Very similar to at, but does not insist that the execution time be entered on the command line. See at for details. Options -f file Read job from file, not standard input. -m Mail user when job has completed, regardless of whether output was created. -q letter Place job in queue denoted by letter, where letter is one letter from a-z or A-Z. The default queue is a. (The batch queue defaults to b.) Higherlettered queues run at a lower priority. -V Print the version number and then exit. -v Display the time a job will be executed. Return to: Alphabetical Directory of Linux Commands Sponsored by:
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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
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