I have written a shell script which will invoke perl script infinitly in the background in a loop. Code will do as:Within while loop, perl script will be run in background, get the pid and notify pid in though mail. then wait for pid to be completed before going for next iteration. I am running the shell in background itself.
while [1] do
- invoke perl script in background
- get pid and mial
- wait for pid
- sent mail about job finining
- sleep for some time
done.
Exact Code:
If run the shell in background then current shell is logging out but shell script and perl scripts are still running in background. Do you see any problem with code? Also I set the 'set +o errexit'. Why the script will exit suddenly? What are the other possible reasons?
Here is the OS info:
Please help what I need to check? it very urgent. I am very new to linux env.
I would really like to have a script that will accept the key press from the user with out having to press the enter key afterwards.
i.e.
echo "Press Y to print \c"
read YesNo
At this point the user has to press the enter key to continue. Is there a way to accept the key press from the... (3 Replies)
I am trying to test input from the user, if they press enter with out an Y or N. I have the characheter thing sorted but when it comes to a blank or empty key press I am having trouble.
if ; then
clear
echo "Sorry, that is an invalid choice!"
exit
fi
I am using a KSH script in... (3 Replies)
How can I trap a character press in the shell script.
For eg:- I have a script runinng a infinite loops , I will need to quit if q is pressed.
I have seen the traping the signal , but they give option only for traping the defined interrupt signals. But those does not help me here. (3 Replies)
Hello!
Sorry, for my not so perfect english!
I want to stop bash shell script execution until any key is pressed.
This line in a bash shell script
read -n1 -r -p "Press any key to continue..." key
produces this error
When I run this from the command line
usera@lynx:~$ read... (4 Replies)
I am using C Shell MKS Toolkit and I ran into a huge problem when setting up some environment variables.:confused:
The csh script that I have as my login script runs fine but very very slow.
When I add a directory to my PATH it seems to slow down shell startup and even slow down the commands. ... (0 Replies)
hi to all.
im a newbie in unix shell scripts. i want to make a simple unix shell script using the bash shell that asks a user to press any key after a series of commands, or an x if he wishes to exit. here's a sample script that i made:
#!/usr/bin/bash
pause(){
/usr/bin/echo "\t\t Press... (3 Replies)
I want to detect key pressed in my .cgi web page, but it does not work even I found the code in other web site.
My code is :
#!/bin/sh
#=================================================
# PATH defination
# ================================================... (2 Replies)
Hi,
I have been trying to do a small fun project for myself.
I want to run a command for 45 seconds.
And to get the final output of this command, the script requires I push the "q" key on my keyboard and then the final output file becomes available.
I tried the following script. But it... (12 Replies)
Discussion started by: jacobs.smith
12 Replies
LEARN ABOUT PLAN9
script
SCRIPT(1) User Commands SCRIPT(1)NAME
script - make typescript of terminal session
SYNOPSIS
script [options] [file]
DESCRIPTION
script makes a typescript of everything displayed 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 the dialogue in this file. If no filename is given, the dialogue is saved in the file type-
script.
OPTIONS -a, --append
Append the output to file or to typescript, retaining the prior contents.
-c, --command command
Run the command rather than an interactive shell. This makes it easy for a script to capture the output of a program that behaves
differently when its stdout is not a tty.
-e, --return
Return the exit code of the child process. Uses the same format as bash termination on signal termination exit code is 128+n.
-f, --flush
Flush output after each write. This is nice for telecooperation: one person does `mkfifo foo; script -f foo', and another can
supervise real-time what is being done using `cat foo'.
--force
Allow the default output destination, i.e. the typescript file, to be a hard or symbolic link. The command will follow a symbolic
link.
-q, --quiet
Be quiet (do not write start and done messages to standard output).
-t[file], --timing[=file]
Output timing data to standard error, or to file when given. This data contains two fields, separated by a space. The first field
indicates how much time elapsed since the previous output. The second field indicates how many characters were output this time.
This information can be used to replay typescripts with realistic typing and output delays.
-V, --version
Display version information and exit.
-h, --help
Display help text and exit.
NOTES
The script ends when the forked shell exits (a control-D for 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. script works best with commands that do not manipulate
the screen, the results are meant to emulate a hardcopy terminal.
It is not recommended to run script in non-interactive shells. The inner shell of script is always interactive, and this could lead to
unexpected results. If you use script in the shell initialization file, you have to avoid entering an infinite loop. You can use for
example the .profile file, which is read by login shells only:
if test -t 0 ; then
script
exit
fi
You should also avoid use of script in command pipes, as script can read more input than you would expect.
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), scriptreplay(1)HISTORY
The script command appeared in 3.0BSD.
BUGS
script places everything in the log file, including linefeeds and backspaces. This is not what the naive user expects.
script is primarily designed for interactive terminal sessions. When stdin is not a terminal (for example: echo foo | script), then the
session can hang, because the interactive shell within the script session misses EOF and script has no clue when to close the session. See
the NOTES section for more information.
AVAILABILITY
The script command is part of the util-linux package and is available from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils
/util-linux/>.
util-linux June 2014 SCRIPT(1)