Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Unix shell scripting
Top Forums Shell Programming and Scripting Unix shell scripting Post 302074366 by azrealhk on Tuesday 23rd of May 2006 12:19:16 AM
Old 05-23-2006
I have seen ls, wc etc give false readings if the file is opened by another program which is writing to it.

if the output is not flushed then file size etc remains the same.
try....

# cat flush.pl
#!/usr/local/bin/perl
open FH, ">flush.txt";
for (1..410) {
print FH "abcdefg89\n";
}
sleep 360;
close FH;

NOTE: The string is 10 chars (including \n), 410 lines written before sleep. therefore size should be 4100 bytes. The file is already open and not close yet on the sleep.

# tail flush.txt
abcdefg89
abcdefg89
abcdefg89
abcdefg89
abcdefg89
abcdefg89
abcdefg89
abcdefg89
abcdefg89
abcdefg89
abcdef

The block size of our system is 4096 so instead of 4100 bytes, 4096 is seen. The tail command will only show upto 4096 bytes.

# ls -l flush.txt
-rw-r--r-- 1 root system 4096 May 23 12:06 flush.txt

Ls confirms only 4096 bytes is seen

# wc -l flush.txt
409 flush.txt

wc -l shows only 409 and note 410.

The file will only show 4100 when you close the file.

# ls -l flush.txt
-rw-r--r-- 1 root system 4100 May 23 12:18 flush.txt
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Unix shell scripting

I need to write a script which analyses an invoice file, counting the amount of pages in the file to be printed per account number and per invoice. The account numbers are stored in another file which has instructions on what do with ach customers invoice as per their account number. please... (6 Replies)
Discussion started by: la_burton
6 Replies

2. Shell Programming and Scripting

difference between AIX shell scripting and Unix shell scripting.

please give the difference between AIX shell scripting and Unix shell scripting. (2 Replies)
Discussion started by: haroonec
2 Replies

3. Shell Programming and Scripting

Unix Shell Scripting

Hi All, Greetings!! I am trying to write a script that will get me the syslog.log file output of last week... That is ...my cron will run on Monday and will get me the syslog output of previous week , last monday-last sunday. I tried using date formatting and tail..but did not succeed.... (4 Replies)
Discussion started by: premamadhuri
4 Replies

4. UNIX for Advanced & Expert Users

Need your Help on Unix Shell Scripting.........

Hi Friends, 1. Bash Shell Scrpt to take backup at evening 2. I need a bash shell script for killing all processes. (5 Replies)
Discussion started by: vinayraj
5 Replies

5. Shell Programming and Scripting

Unix Shell Scripting

I 'm new to unix shell scripting can some one guide me to any e-book or link from where i can learn unix shell scripting .. i want to learn create interactive scripts for my day to day solaris work. Any help would be appreciated (1 Reply)
Discussion started by: fugitive
1 Replies

6. UNIX for Dummies Questions & Answers

Unix Shell Scripting( Calling from Unix to PLSQL)

Hello Experts, I have the following questions to be discussed here at this esteemed discussion forum. I have two Excel sheets which contain Unix Commands llike creating directory the structure/ftp/Copy/Zip etc to basically create an environment. I need help in understanding some of... (1 Reply)
Discussion started by: faizsaadq
1 Replies

7. UNIX for Dummies Questions & Answers

Unix Shell Scripting

I'm sorry if this doesn't go here, but I'm in depserate need of help with my last unix homework. Anyways, I'm taking summer classes, and one of them is UNIX. I've understood everything thus far, but I'm having a killer time with how my instructor has worded the problems for shell scripting. I... (3 Replies)
Discussion started by: dw15
3 Replies

8. Shell Programming and Scripting

UNIX shell scripting

I am new to Unix.. Can someone please help me to understand the concept of Login shell and non login shell ? what exactly the difference between them :confused: (1 Reply)
Discussion started by: lokita jain
1 Replies

9. Programming

unix Shell scripting

Hi All, need help to complete the automation but stuck at a perticular situation below is the code <code> fixed_function_name { code.... code.... variable_map= { a="/a" b="/b" c="/c" so on... } (7 Replies)
Discussion started by: yadavricky
7 Replies

10. UNIX for Beginners Questions & Answers

UNIX Shell Scripting

Describe in short the word completion feature of the tcsh Completion works anywhere in the command line, not at just the end, for both commands and filenames. Type part of a word and hit the Tab key, and the shell replaces the incomplete word with the complete one in the input buffer. The... (1 Reply)
Discussion started by: Elena Lauren
1 Replies

LEARN ABOUT DEBIAN

git-sh-i18n

GIT-SH-I18N(1)							    Git Manual							    GIT-SH-I18N(1)

NAME

       git-sh-i18n - Git's i18n setup code for shell scripts

SYNOPSIS

       . "$(git --exec-path)/git-sh-i18n"

DESCRIPTION

       This is not a command the end user would want to run. Ever. This documentation is meant for people who are studying the Porcelain-ish
       scripts and/or are writing new ones.

       The 'git sh-i18n scriptlet is designed to be sourced (using .) by Git's porcelain programs implemented in shell script. It provides
       wrappers for the GNU gettext and eval_gettext functions accessible through the gettext.sh script, and provides pass-through fallbacks on
       systems without GNU gettext.

FUNCTIONS

       gettext
	   Currently a dummy fall-through function implemented as a wrapper around printf(1). Will be replaced by a real gettext implementation in
	   a later version.

       eval_gettext
	   Currently a dummy fall-through function implemented as a wrapper around printf(1) with variables expanded by the git-sh-
	   i18n--envsubst(1) helper. Will be replaced by a real gettext implementation in a later version.

GIT

       Part of the git(1) suite

Git 1.7.10.4							    11/24/2012							    GIT-SH-I18N(1)
All times are GMT -4. The time now is 05:07 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy