I need to grep a particular line from the output of the script x, Which i expect to be outputted within the first 20 lines, However this scripts stays running forever till i do a ctrl z.
So i am trying to create a script y which will execute script x grep for the expected output and ctrl d from script x. and output the findings from executing script x.
Script y
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Calls script x looks for a pattern and ctrl z from script x.
i need to be able to force exit the script x when i find the pattern
as script x runs continuous
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First of all, I apologize for the lack of "attention to detail". You stated the first 20 lines, not the last 20 lines. In this case, just to correct myself, it would be:
or
Now, on with what you are actually wanting. I find your logic a bit confusing. What I would do, in this case it to take script x and code it to log everything that you need to a log file. I would then have script y run, and run script x, just like you were wanting. After it starts script x, make sure you get the PID of the process and load it into a variable. Then have script y grep the log file of script x and when if finds a match for what you are looking for, have script y kill the pid of script x.
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LEARN ABOUT OSF1
script
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)