11-15-2005
file reading in unix
Hi ,
I need to read line by line from a file. Can u please tell me the most efficient way to do it. SInce i will be reading more than 1000 files in my program. i am trying the following options :
1. nawk option
nawk'{
print $0
}'files.temp
2.
filecount=`cat files.temp | wc -l`
i=1
while [ $i -le $filecount ]
do
filename=`cat files.temp | head -$i | tail -1`
#echo $filename
done
can u please tell me the best way to do this.
10 More Discussions You Might Find Interesting
1. UNIX for Advanced & Expert Users
Can any u pls tell me :-
I want to read a particular line from a file, say line no. 10.
This can be done by using awk..but that method I think, is inefficient.
Is there any direct command for this?
Thanks (2 Replies)
Discussion started by: yeheyaansari
2 Replies
2. UNIX for Advanced & Expert Users
I have a file that has a list of numbers in it. Each line has a different number. I am trying to create some sort of loop within a script that will pick the numbers up on lines 1 and 2 and then put those figures into the script. It then goes through the process then loops back and reads lines 2 and... (5 Replies)
Discussion started by: mariner
5 Replies
3. Filesystems, Disks and Memory
I found a more appropriate section to post my question. Thanks! (0 Replies)
Discussion started by: cneill
0 Replies
4. UNIX for Dummies Questions & Answers
Hi,
I am a beginner in scripting...I have to do a script where I have to read a file which has list of job names, line by line and for every line execute a dsjob command to find the log details of the job and extract only the start time of the job, if it is greater than jan 01 2008 and create... (1 Reply)
Discussion started by: Vijay81
1 Replies
5. Shell Programming and Scripting
I have been doing automation of daily check activity for a server, i have been using sqls to retrive the data and while loop for reading the data from the file for several activities. BUT i got a show stopper the below one.. where the data is getting store in $temp_file, but not being read by while... (1 Reply)
Discussion started by: KuldeepSinghTCS
1 Replies
6. Shell Programming and Scripting
i have a directory that has n files starting with ABC_00x.txt and ABC_00x.txt where x is the integer number.
i want to read the contents of each file and write it into a log file.
can somebody help me in writing the shell script in unix (3 Replies)
Discussion started by: vkca
3 Replies
7. Shell Programming and Scripting
Hi All
I have written the following script:
#!/bin/ksh
while read cmdline
do
echo `$cmdline`
pid="$cmdline"
done<commands.txt
===========
commands.txt contains:
ps -ef | grep abc | grep xyz |awk '{print $2};
My objective is to store the o/p of the command in a variable and do... (8 Replies)
Discussion started by: rahulparo
8 Replies
8. Shell Programming and Scripting
I have a file proc.txt:
if @debug = 1 then
message 'Start Processing ', @procname, dateformat(now(*), 'hh:mm:ss'), @julian type info to client;
end if;
/*
execute immediate with quotes
'insert into sys_suppdata (property, value, key_name)
location ''' || @supp_server || '.' ||... (5 Replies)
Discussion started by: kidncute
5 Replies
9. Shell Programming and Scripting
Hi,
Could someone let me know how to read input from a web page into a unix file.
I am writing my script in bash shell in Solaris version.
Thanks in advance,
ayarlaga. (7 Replies)
Discussion started by: ayarlaga
7 Replies
10. UNIX for Dummies Questions & Answers
Is there a script that will automatically access/count the words in each individual file for a program?
(Sorry, I'm trying to help my girlfriend who's in computer science out, I know nothing about this. We're having trouble wording this question.) (1 Reply)
Discussion started by: Triple M
1 Replies
LEARN ABOUT HPUX
rc.config
rc.config(4) Kernel Interfaces Manual rc.config(4)
NAME
rc.config, rc.config.d - files containing system configuration information
SYNOPSIS
DESCRIPTION
The system configuration used at startup is contained in files within the directory The file sources all of the files within and and
exports their contents to the environment.
/etc/rc.config
The file is a script that sources all of the scripts, and also sources To read the configuration definitions, only this file need be
sourced. This file is sourced by whenever it is run, such as when the command is run to transition between run states. Each file that
exists in is sourced, without regard to which startup scripts are to be executed.
/etc/rc.config.d
The configuration information is structured as a directory of files, rather than as a single file containing the same information. This
allows developers to create and manage their own configuration files here, without the complications of shared ownership and access of a
common file.
/etc/rc.config.d/* Files
This is where files containing configuration variable assignments are located.
Configuration scripts must be written to be read by the POSIX shell, and not the Bourne shell, or In some cases, these files must also be
read and possibly modified by control scripts or the sam program. See sd(4) and sam(1M). For this reason, each variable definition must
appear on a separate line, with the syntax:
No trailing comments may appear on a variable definition line. Comment statements must be on separate lines, with the comment character in
column one. This example shows the required syntax for configuration files:
Configuration variables may be declared as array parameters when describing multiple instances of the variable configuration. For example,
a system may contain two network interfaces, each having a unique IP address and subnet mask (see ifconfig(1M)). An example of such a dec-
laration is as follows:
Note that there must be no requirements on the order of the files sourced. This means configuration files must not refer to variables
defined in other configuration files, since there is no guarantee that the variable being referenced is currently defined. There is no
protection against environment variable namespace collision in these configuration files. Programmers must take care to avoid such prob-
lems.
/etc/TIMEZONE
The file contains the definition of the environment variable. This file is required by POSIX. It is sourced by at the same time the files
are sourced.
SEE ALSO
rc(1M).
rc.config(4)