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Full Discussion: trying to create printf script
Top Forums Shell Programming and Scripting trying to create printf script Post 302413081 by pkohn11 on Wednesday 14th of April 2010 12:50:30 PM
Old 04-14-2010
Quote:
Originally Posted by Corona688
You're using printf like echo, which it's not. 'printf "%s" a b c d' will only print a because you're only telling it to print one string with '%s'. You might as well just use echo and print all of them.

You don't even need a variable here. Just echo it right into the file.
Code:
echo "$RANDOM"."$RANDOM" "$RANDOM"."$RANDOM" "$RANDOM"."$RANDOM" "$RANDOM"."$RANDOM" > ./bp1/bin/random

This may not be the best way to generate random numbers. If RANDOM is between 0 and 65536, you'll never have a decimal point higher than .65. Let's try printf again, properly, with:

Code:
#!/bin/bash
( for ((N=0; N<4; N++))
do
        printf " %d.%03d" "$((RANDOM%1000))" "$((RANDOM%1000))"
done ) > ./bp1/bin/random

This should generate random numbers between 0 and 1000, with three decimal places.
I know this isn't the proper way to do it but I am currently in a Linux/Unix programming class and they want this to be done using printf and $RANDOM (which I've never done it this way before). I need a new variable and a file both with the same outputted data.
 

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LEARN ABOUT OPENDARWIN

script

SCRIPT(1)						    BSD General Commands Manual 						 SCRIPT(1)

NAME

     script -- make typescript of terminal session

SYNOPSIS

     script [-a] [-k] [-q] [-t time] [file [command ...]]

DESCRIPTION

     The script utility makes a typescript of everything printed on your terminal.  It is useful for students who need a hardcopy record of an
     interactive session as proof of an assignment, as the typescript file can be printed out later with lpr(1).

     If the argument file is given, script saves all dialogue in file.	If no file name is given, the typescript is saved in the file typescript.

     If the argument command ... is given, script will run the specified command with an optional argument vector instead of an interactive shell.

     Options:

     -a       Append the output to file or typescript, retaining the prior contents.

     -k       Log keys sent to program as well as output.

     -q       Run in quiet mode, omit the start and stop status messages.

     -t time  Specify time interval between flushing script output file.  A value of 0 causes script to flush for every character I/O event.  The
	      default interval is 30 seconds.

     The script ends when the forked shell (or command) exits (a control-D to exit the Bourne shell (sh(1)), and exit, logout or control-d (if
     ignoreeof is not set) for the C-shell, csh(1)).

     Certain interactive commands, such as vi(1), create garbage in the typescript file.  The script utility works best with commands that do not
     manipulate the screen.  The results are meant to emulate a hardcopy terminal, not an addressable one.

ENVIRONMENT

     The following environment variable is utilized by script:

     SHELL  If the variable SHELL exists, the shell forked by script will be that shell.  If SHELL is not set, the Bourne shell is assumed.  (Most
	    shells set this variable automatically).

SEE ALSO

     csh(1) (for the history mechanism).

HISTORY

     The script command appeared in 3.0BSD.

BUGS

     The script utility places everything in the log file, including linefeeds and backspaces.	This is not what the naive user expects.

     It is not possible to specify a command without also naming the script file because of argument parsing compatibility issues.

     When running in -k mode, echo cancelling is far from ideal.  The slave terminal mode is checked for ECHO mode to check when to avoid manual
     echo logging.  This does not work when in a raw mode where the program being run is doing manual echo.

BSD
								   June 6, 1993 							       BSD
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