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Full Discussion: Random Line
Top Forums Shell Programming and Scripting Random Line Post 31812 by LivinFree on Wednesday 13th of November 2002 04:42:01 PM
Old 11-13-2002
Random Line

I am trying to build a script written in ksh93 that pulls a random line out of each of four text files.

Since the files are all different, I can't think of a way to take the number of lines (in one case, let's say 50), then randomly pick a line out, making sure that all lines have a fair chance...

I tried playing with some variations of division and comparison of the $RANDOM variable, but I was unsuccessful in making sure I didn't pick the same few lines over and over...

Any suggestions?
 

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wc(1)								   User Commands							     wc(1)

NAME
wc - display a count of lines, words and characters in a file SYNOPSIS
/usr/bin/wc wc [-c | -m | -C] [-lw] [file]... ksh93 wc [-c | -m | -C] [-lLqw] [file]... DESCRIPTION
/usr/bin/wc wc reads one or more input files and, by default, writes the number of NEWLINE characters, words and bytes contained in each input file to the standard output. wc also writes a total count for all named files, if more than one input file is specified. wc considers a word to be a non-zero-length string of characters delimited by white space (for example, SPACE, TAB). See iswspace(3C) or isspace(3C). ksh93 The wc built-in in ksh93 is associated with the /bin and /usr/bin paths. It is invoked when wc is executed without a pathname prefix and the pathname search finds a /bin/wc or /usr/bin/wc executable. wc reads one or more input files and, by default, for each file writes a line containing the number of NEWLINEs, words, and bytes contained in each file followed by the file name to standard output in that order. A word is defined to be a non-zero length string delimited by iss- pace(3C) characters. If more than one file is specified, wc writes a total count for all of the named files with total written instead of the file name. By default, wc writes all three counts. Options can specified so that only certain counts are written. The -c, -C, and -m options are mutu- ally exclusive. If no file is specified, or if the file is -, wc reads from standard input and no filename is written to standard output. The start of the file is defined as the current offset. -c --bytes | chars List the byte counts. -l --lines List the line counts. -L --longest-line | max-line-length List the longest line length. -m | C --multibyte-chars List the character counts. -q --quiet Suppress invalid multi-byte character warnings. -w --words List the word counts. OPTIONS
The following options are supported: -c Counts bytes. -C Same as -m. -l Counts lines. -m Counts characters. -w Counts words delimited by white space characters or new line characters. Delimiting characters are Extended Unix Code (EUC) charac- ters from any code set defined by iswspace(). If no option is specified, the default is -lwc (counts lines, words, and bytes.) OPERANDS
The following operand is supported: file A path name of an input file. If no file operands are specified, the standard input is used. USAGE
See largefile(5) for the description of the behavior of wc when encountering files greater than or equal to 2 Gbyte ( 2^31 bytes). ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of wc: LANG, LC_ALL, LC_CTYPE, LC_MES- SAGES, and NLSPATH. EXIT STATUS
0 Successful completion. >0 An error occurred. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: /usr/bin/wc +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |CSI |Enabled | +-----------------------------+-----------------------------+ |Interface Stability |Committed | +-----------------------------+-----------------------------+ |Standard |See standards(5). | +-----------------------------+-----------------------------+ ksh93 +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |Interface Stability |See below. | +-----------------------------+-----------------------------+ The ksh93 built-in binding to /bin and /usr/bin is Volatile. The built-in interfaces are Uncommitted. SEE ALSO
cksum(1), ksh93(1), isspace(3C), iswalpha(3C), iswspace(3C), setlocale(3C), attributes(5), environ(5), largefile(5), standards(5) SunOS 5.11 13 Mar 2008 wc(1)
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