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Top Forums UNIX for Dummies Questions & Answers Display header in script output Post 302864049 by Decoy Octopus88 on Tuesday 15th of October 2013 06:27:38 PM

10-15-2013

Registered User

The script name is highest
The first required parameter is "filename" and the filename here is "albums". If no "filename" is provided a message is displayed.
The second parameter is an optional number [how many] meaning how many albums/artist do you want to display (default of 10).
There is also a requirement that if the user uses the -h option, it would create a header "ALBUMS ARTIST" + newline, and if the -h is not used as an option, then no header or new line would exist, but the rest of the script will run. If the user enters a different option such as -a, an invalid option message is displayed. My file "albums" is above, but here is the entire script and also the output with the messages. Note when i run the script without the -h it runs great, minus the header. When run it with -h, i have problems. Thanks again.

script (highest)

Code:

while getopts ":h" opt; do
  case $opt in
    h)
      print -n "ALBUMS ARTIST\n" >&2
      ;;
    \?)
      echo "Invalid option: -$OPTARG" >&2
      ;;
  esac
done

filename=$1
filename=${filename:?"Filename Missing, include the filename after the \"highest\" script as an arguement."}
howmany=$2
sort -nr "$filename" | head -${howmany:=10}

output

Code:

$ highest albums 9
22 Tom Petty
20 Led Zeppelin
18 Stone Temple Pilots
17 Rolling Stones
16 Aerosmith
12 Black Crowes
10 Nirvana
8 Van Halen
5 ACDC
$ 
$ 
$ 
$ 
$ highest -h albums 9
ALBUMS ARTIST
sort: options '-hn' are incompatible
head: invalid option -- 'a'
Try 'head --help' for more information.
$

Decoy Octopus88

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LEARN ABOUT OPENSOLARIS

script

script(1)							   User Commands							 script(1)

NAME

       script - make record of a terminal session

SYNOPSIS

       script [-a] [filename]

DESCRIPTION

       The  script  utility  makes a record of everything printed on your screen. The record is written to filename. If no file name is given, the
       record is saved in the file typescript. See WARNINGS.

       The script command forks and creates a sub-shell, according to the value of $SHELL, and records the text from this session. The script ends
       when the forked shell exits or when Control-d is typed.

OPTIONS

       The following option is supported:

       -a    Appends the session record to filename, rather than overwriting it.

NOTES

       script places everything that appears on the screen in filename, including prompts.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |CSI			     |Enabled			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5)

WARNINGS

       script  can  pose  a  security risk when used in directories that are writable by other users (for example, /tmp), especially when run by a
       privileged user, that is, root. Be sure that typescript is not a link before running script.

SunOS 5.11							    30 Jan 2004 							 script(1)