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Full Discussion: Variables into SED or AWK and multiple commands
Top Forums Shell Programming and Scripting Variables into SED or AWK and multiple commands Post 302609389 by agama on Monday 19th of March 2012 08:15:04 PM
Old 03-19-2012
I guessed a bit, and this code isn't complete, so it should get you started:

Code:
#!/usr/bin/env ksh
# the previous line can be replaced with #!/usr/bin/env bash 
# if you prefer to use bash

printf "enter filename: "
read filename
printf "do you want to enter data [yes|no] "
read ans
case $ans in
    y*|Y*)
            printf "enter search data: "
            read data                       # your description didnt indicate what to do with data
            ;;
    n*|N*)
            ;;              # just continue

    *)      printf "invalid reply; expected Y(es) or N(o)\n"
            exit 1
            ;;
esac

#
#  couldn't tell if this needed to be executed only if user entered no, or in all cases
#
date=$( date +%Y%m%d$H%M%S )                # date for the filename in a variable should it need to be used again
newfilename="testfile.$date"                # complete filename
sed ..... <$filename >$newfilename          # incomplete command, not sure what you need the sed to do
sleep 3
sed   -e '/./{H;$!d;}' -e "x;/$data/d" <$netfilename >not-sure-what-file-for-here



You didn't indicate what to do with the data entered if the user answered 'yes' to the second prompt. I also wasn't sure if a no response was the only time the sed commands were to be executed, or if no was just to avoid entering the data and the sed commands would always be executed.
Last edited by agama; 03-19-2012 at 09:16 PM.. Reason: #! alternate
 

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LEARN ABOUT OSF1

printenv

env(1)							      General Commands Manual							    env(1)

NAME

       env, printenv - Displays or sets the current environment, or displays the values of environment variables

SYNOPSIS

   Current Syntax
       env [-i] [name=value...] [command] [args...]

       printenv [name]

   Obsolescent Syntax
       env [-] [name=value...] [command] [args...]

STANDARDS

       Interfaces documented on this reference page conform to industry standards as follows:

       env:  XCU5.0

       Refer to the standards(5) reference page for more information about industry standards and associated tags.

OPTIONS

       Invokes	utility  with exactly the environment specified by the arguments; the inherited environment is ignored completely.  Changes are in
       effect only while the specified command is running.  Dash is equivalent to -i option.

OPERANDS

       Changes in the form name=value are added to the current environment before the command is run.  [Tru64 UNIX]  Name of an environment  vari-
       able to be printed.  Name of a command to be invoked with the modified environment.  Arguments to be passed to command when it is executed.

DESCRIPTION

       The  env command lets you get and change your current environment, and then run the specified command with the changed environment.  If the
       -i option is used, the current environment is ignored and the command runs with only the changed environment.  Changes are only	in  effect
       while the specified command is running.

       If command is not specified, env displays your current environment, one name=value pair per line.

       [Tru64  UNIX]  The  printenv  command  displays	the  values  of the variables in the environment.  If name is specified, only its value is
       printed.  If name is not the name of a currently set environment variable, only a blank line is printed, no error is reported.  If name	is
       not specified, printenv displays the current environment, one name=value per line.

EXIT STATUS

       If  command  is	invoked,  the exit status of env is the exit status of command; otherwise, the env utility exits with one of the following
       values: The env utility completed successfully.	An error occurred in the env utility.  The command specified  by  command  was	found  but
       could not be invoked.  The command specified by command could not be found.

EXAMPLES

       To add a shell variable to the environment for the duration of one command (sh only), enter: TZ=MST7MDT date env TZ=MST7MDT date

	      Each  of	these  commands displays the current date and time in Mountain Standard Time.  The two commands shown are equivalent. When
	      date is finished, the previous value of TZ takes effect again.   To  replace  the  environment  with  another  one,  enter:  env	-i
	      PATH=$PATH IDIR=/u/jim/include LIBDIR=/u/jim/lib make

	      This runs make in an environment that consists only of these definitions for PATH, IDIR, and LIBDIR.  You must redefine PATH so that
	      the shell can find the make command.

	      When make is finished, the previous environment takes effect again.  To find the current setting of the TERM  environment  variable,
	      enter: printenv TERM

	      The command returns the value for the TERM environment variable.

ENVIRONMENT VARIABLES

       The  following  environment variables affect the execution of env: Provides a default value for the internationalization variables that are
       unset or null. If LANG is unset or null, the corresponding value from the default locale is used.  If any of the internationalization vari-
       ables  contain  an  invalid setting, the utility behaves as if none of the variables had been defined.  If set to a non-empty string value,
       overrides the values of all the other internationalization variables.  Determines the locale for the interpretation of sequences  of  bytes
       of  text data as characters (for example, single-byte as opposed to multibyte characters in arguments).	Determines the locale for the for-
       mat and contents of diagnostic messages written to standard error.  Determines the location of message catalogues  for  the  processing	of
       LC_MESSAGES.

SEE ALSO

       Commands:  csh(1), ksh(1), Bourne shell sh(1b), POSIX shell sh(1p)

       Functions:  exec(2)

       Standards:  standards(5)

																	    env(1)
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