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Top Forums UNIX for Dummies Questions & Answers Read data from given filename or stream Post 302588116 by ysrini on Friday 6th of January 2012 07:04:20 PM
Old 01-06-2012
Read data from given filename or stream

I have a script that takes 2 parameters (say) as mandatory
script1.sh a b

The 3rd parameter can be filename which it should process or it can come through a pipeline stream
The script should work both ways:

script1.sh a b filec
or cat filec | script1.sh a b

How to put logic in the script?
If 3rd parameter is not passed then how can the script know it was fed data from filec thru pipe?
and what shell variable holds this information?

Thanks,
-srinivas yelamanchili
 

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script(1)						      General Commands Manual							 script(1)

NAME
script - Makes a transcript of terminal session SYNOPSIS
script [-a] [file] The script command makes a transcript of everything printed on your terminal. OPTIONS
Appends the transcript to file rather than writing it to file. OPERANDS
The name of an output file that will contain the transcript of the session. If this parameter is omitted, the file typescript is written. DESCRIPTION
The transcript is written to file, or appended to file if the -a option is given. If no file name is given, the transcript is saved in the file typescript. The script ends when the forked shell exits. This program is useful when you are using a CRT and want a hard-copy record of the dialog (for example, a technical writer might create an example of a working session this way). If you specify the -a option and the file does not exist, it is created. If you do not specify the -a option and the file exists, it is replaced. RESTRICTIONS
The script command requires a streams based terminal. In single user mode, streams may not be enabled. Under these circumstances, script will exit with no action. If you are the superuser and need to run this command in single user mode, use the following special instruc- tions. Enabling Streams If it is necessary to enable a streams environment in the single user mode, enter the command /sbin/init.d/streams. This command is avail- able to the superuser only. SEE ALSO
Commands: autopush(8), cat(1), echo(1), strsetup(8), tee(1) System Administration script(1)
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