Or if you want to stick with /usr/bin/sh, this should work:
The trick is "while true"... It basically says that any time the "true" command returns true (always), do the following. Another common way of looking like that is to say "while :" - the ":" command will always return true also.
Hi,
I'm pretty new to UNIX shell scripting and need some help. We have an Informatica interface that dumps any files that have errors into a directory. I need to check that directory periodically for any of up to 9 files that might be in it and run a specific process for each file found. The... (3 Replies)
Hi,
PHP user here. I'm using an endless loop to perform to mimic a cron. The script does something every 20 minutes. It sleep()s in the meantime.
I have various checks that ensure that only instance can run, including a "gentleman agreement" locked file.
However, I'd like to make sure... (2 Replies)
When finding a string in files within a directory, one can use this:
grep -r "searchstring" dir/subdir/ > listofoccurrences.txt
For brevity sake one can enter the intended directory and use this:
grep -r "searchstring" . > listofoccurrences.txt
which as I found out leads to an endless loop,... (2 Replies)
Dear experts,
I have done a re-installation of sco unix openserver 5.0.5 and managed to create users. The problem am facing is that of one user logging in more than 5 times. How can i overcome this problem. the system give the error below.
-sh: fork failed - too many processes in sco unix... (5 Replies)
Hi all.
I wrote a program with the Motif Widget Toolkit. It has a
button and a scrollbar. When the user hits the button the
callback creates a new fork() thread. The new thread sleeps
for a while and then changes the position of the scrollbar.
It does this in an endless loop.
I need the... (2 Replies)
First time post. I did a search so I didn’t see this specific issue. It seems to be a head scratcher for me.
I have an hourly job that on rare occasions, gets into an endless loop.
I’ve tried different scenarios but the current version does basically the following.
Find all the *.arc files and... (18 Replies)
Hi All,
I've written a script to read 2 files and compare the contents using while loop but somehow when $line is not found in test2, the script will continue looping.
Below is my code, pls advise what could went wrong
TIA
Nick
for line in test1.txt | while read line
do
grep -i... (4 Replies)
Hello,
I am running Oracle Database and after a while I keep getting this message whenever I execute any command.
I cannot execute any command even shutdown, whenever I execute any command , I get this message
/usr/bin/ksh: 0403-031 The fork function failed. There is not enough memory... (7 Replies)
Hi,
AM very new to shell scripting and try to run a simple do while loop statement, but it ends up running endlessly. please can anyone assist, dunno what am doing wrong, any useful suggestions will be welcomed.
#!/bin/ksh
### To check a running process instance
#################... (5 Replies)
I was practicing writing simple loops as I am a new bash user and I created this script, which turned out to be an endless loop where the echo output does not stop and I do not see where my mistake is.
#!/bin/bash
echo 'enter a number from 1 to 100'
read number
while
do
... (2 Replies)
Discussion started by: goldenlinx
2 Replies
LEARN ABOUT X11R4
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)