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Top Forums Shell Programming and Scripting Script in bash that works only some of the time Post 302960918 by twinion on Sunday 22nd of November 2015 02:10:56 AM
Old 11-22-2015
Quote:
Originally Posted by balajesuri
I don't see why you're performing cat on a directory. Is this a typo? If not, you will not get your intended results. Also, you can grep directly on the file instead of piping the cat output to grep. Read this "useless use of cat".
sorry that is a typo when written into the forum

mytest15=`cat /pathtofile/filename | grep -c filename.$DATE.TXT | grep TRL | wc -l`

basically i know the file has completed writing when it has the word TRL in the file.

---------- Post updated at 02:10 AM ---------- Previous update was at 02:04 AM ----------

Quote:
Originally Posted by Peasant
Other then mentioned, use #!/bin/bash -x and examine the nohup.out during the hang.

If you are on linux system, inotify should provide much better interface for actions on file changes.

Please, if you can, post the entire code and/or explain what are you trying to do so perhaps a better approach could be written.

Hope that helps
Regards
Peasant.
-x i will give that a try.

im positive it could be written a hell of alot better as im still very new.

what the script does is waits for a file to be written to a directory.
when that file arrives, it then waits for it to finish being built by looking for TRL inside the file.
Then it renames the file and moves it.

as i said ran ti yesterday worked fine.
ran it today in the background it didnt see that the file arrived.
so i killed it then ran it
ran it normally...it spotted the file and worked as expected.
i just dont understand why it was in the background it didnt notice that the file was there, and yesterday it worked fine
 

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SCRIPT(1)						    BSD General Commands Manual 						 SCRIPT(1)

NAME
script -- make typescript of terminal session SYNOPSIS
script [-a] [-c COMMAND] [-e] [-f] [-q] [-t] [file] DESCRIPTION
Script makes a typescript of everything printed 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 all dialogue in file. If no file name is given, the typescript is saved in the file typescript. Options: -a Append the output to file or typescript, retaining the prior contents. -c 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 the exit code of the child process. Uses the same format as bash termination on signal termination exit code is 128+n. -f Flush output after each write. This is nice for telecooperation: One person does `mkfifo foo; script -f foo' and another can super- vise real-time what is being done using `cat foo'. -q Be quiet. -t Output timing data to standard error. 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. The script ends when the forked shell exits (a control-D to exit 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. 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. AVAILABILITY
The script command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/. Linux July 30, 2000 Linux
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