Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Reading a text file using bash
Top Forums Shell Programming and Scripting Reading a text file using bash Post 302837751 by Don Cragun on Friday 26th of July 2013 03:45:25 PM
Old 07-26-2013
You're making it too hard. Try something like:
Code:
#!/bin/bash
line=0
while read ip_address hostname put_location alt_put_location tftpserver
do      ((line++))
        # Skip header line.
        if [ $line -eq 1 ]
        then    continue
        fi
        # Process data from other lines.
        printf "Input line #%d:\n" $line
        printf "\tip address: %s\n" "$ip_address"
        printf "\thostname: %s\n" "$hostname"
        printf "\tput-location: %s\n" "$put_location"
        printf "\talt-put-locaiont: %s\n" "$alt_put_location"
        printf "\ttftpserver: %s\n" "$tftpserver"
done < filename

With the input you specified in your last post, this script produces:
Code:
Input line #2:
	ip address: 192.168.1.1
	hostname: r01-lab1-net
	put-location: /mnt/nas1/fgbu/
	alt-put-locaiont: /opt/fgbu/devicebackup
	tftpserver: 192.168.1.254
Input line #3:
	ip address: 192.168.1.2
	hostname: r01-lab2-net
	put-location: /mnt/nas2/fgbu/
	alt-put-locaiont: /opt/fgbu/backup
	tftpserver: 192.168.1.222

You specified bash; this script will also work with any other POSIX conforming shell.
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

bash: reading filenames from file

Hi, I'm trying to write a script that reads filenames from a file and use these filenames in a loop. The filenames are all on one line and the problem is that these filenames have wildcards like * and braces like in them. Right now what I'm doing is something like this: echo "reading from... (0 Replies)
Discussion started by: warp17
0 Replies

2. Shell Programming and Scripting

Reading from Text file.....

Hi Im MZ.... please help me with my requirements..... Requirement: I have a text file named information.txt which contains information about Oracle Instances, I want to fetch data's from that text file and want to display an output using shell script. Explanation : i.e. when I execute that... (0 Replies)
Discussion started by: user__user3110
0 Replies

3. Shell Programming and Scripting

Problem in reading file (bash)

i get a name from user first name : last name, in this format. Now i am saving this to a file. what i want is, I do not want to save any name if I already have one entry o that same name..what should i do for example user give robert fernandez this will save in file as robert:fernandez. if... (5 Replies)
Discussion started by: Learnerabc
5 Replies

4. Shell Programming and Scripting

Help in reading a cv file in bash

Hi All, I am trying to read a .csv file which has some 6 columns. Eg: samp.csv one, two, three, four six, seven, eight, nine I used the following code, for line in `cat samp.csv` do echo "$line" done It displays every comma seperated values in each line like, one,... (1 Reply)
Discussion started by: johnwilliams.sp
1 Replies

5. Shell Programming and Scripting

Bash: Reading a file and assigning variables from file

I have a file that has four values on each line and I'd like to give each column a variable name and then use those values in each step of a loop. In bash, I believe you could use a while loop to do this or possibly a cat command, but I am super new to programming and I'm having trouble decoding... (2 Replies)
Discussion started by: ccorder22
2 Replies

6. Shell Programming and Scripting

Reading a value from another text file

I am having a text file best = 100 genre = 75 group = 53 . . and so on I need to read those values (100,75,53,...) from my shell script. I have to do the same function for all the variables. So in my script i used for loop to do the same. for { a=best b=100 } Video tutorial on... (3 Replies)
Discussion started by: kishorekumar87
3 Replies

7. Shell Programming and Scripting

Bash to select text and apply it to a selected file in bash

In the bash below I am asking the user for a panel and reading that into bed. Then asking the user for a file and reading that into file1.Is the grep in bold the correct way to apply the selected panel to the file? I am getting a syntax error. Thank you :) ... (4 Replies)
Discussion started by: cmccabe
4 Replies

8. UNIX for Beginners Questions & Answers

Reading a file from a different directory in a Bash script

Hi all, Given here under a section of a script I am using. SIMDIR="/home/Ins/forces" cd $SIMDIR for file in `ls *.forces` do basename=`echo $file | sed 's/\.*$//'` extname=`echo $file | sed 's/*\(*\)\.\(.*\)/\2\1/'` echo "Processing file: "$basename python convert.py... (4 Replies)
Discussion started by: Theo Score
4 Replies

9. Shell Programming and Scripting

Reading from file bash command

Hello, I have a file in the following format id sample platform R1 R2 gene1 gene2 gene3 1 abc llumina R1_001.fastq.gz R2_001.fastq.gz apoe prnpp asp 2 def llumina R1_001.fastq.gz R2_001.fastq.gz apoe prnpp 3 ghi llumina ... (3 Replies)
Discussion started by: nans
3 Replies

10. Programming

How to write in other language in text/xml file by reading english text/xml file using C++?

Hello Team, I have 2 files.one contains english text and another contains Japanese. so i have to read english text and replace the text with Japanesh text in third file. Basically, I need a help to write japanese language in text/xml file.I heard wstring does this.Not sure how do i write... (2 Replies)
Discussion started by: SA_Palani
2 Replies

LEARN ABOUT FREEBSD

if_gre

GRE(4)							   BSD Kernel Interfaces Manual 						    GRE(4)

NAME

     gre -- encapsulating network device

SYNOPSIS

     To compile the driver into the kernel, place the following line in the kernel configuration file:

	   device gre

     Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):

	   if_gre_load="YES"

DESCRIPTION

     The gre network interface pseudo device encapsulates datagrams into IP.  These encapsulated datagrams are routed to a destination host, where
     they are decapsulated and further routed to their final destination.  The ``tunnel'' appears to the inner datagrams as one hop.

     gre interfaces are dynamically created and destroyed with the ifconfig(8) create and destroy subcommands.

     This driver corresponds to RFC 2784.  Encapsulated datagrams are prepended an outer datagram and a GRE header.  The GRE header specifies the
     type of the encapsulated datagram and thus allows for tunneling other protocols than IP.  GRE mode is also the default tunnel mode on Cisco
     routers.  gre also supports Cisco WCCP protocol, both version 1 and version 2.

     The gre interfaces support a number of additional parameters to the ifconfig(8):

     grekey	  Set the GRE key used for outgoing packets.  A value of 0 disables the key option.

     enable_csum  Enables checksum calculation for outgoing packets.

     enable_seq   Enables use of sequence number field in the GRE header for outgoing packets.

EXAMPLES

     192.168.1.* --- Router A  -------tunnel-------- Router B --- 192.168.2.*
						       /
			 			      /
			  +------ the Internet ------+

     Assuming router A has the (external) IP address A and the internal address 192.168.1.1, while router B has external address B and internal
     address 192.168.2.1, the following commands will configure the tunnel:

     On router A:

	   ifconfig greN create
	   ifconfig greN inet 192.168.1.1 192.168.2.1
	   ifconfig greN inet tunnel A B
	   route add -net 192.168.2 -netmask 255.255.255.0 192.168.2.1

     On router B:

	   ifconfig greN create
	   ifconfig greN inet 192.168.2.1 192.168.1.1
	   ifconfig greN inet tunnel B A
	   route add -net 192.168.1 -netmask 255.255.255.0 192.168.1.1

NOTES

     The MTU of gre interfaces is set to 1476 by default, to match the value used by Cisco routers.  This may not be an optimal value, depending
     on the link between the two tunnel endpoints.  It can be adjusted via ifconfig(8).

     For correct operation, the gre device needs a route to the decapsulating host that does not run over the tunnel, as this would be a loop.

     The kernel must be set to forward datagrams by setting the net.inet.ip.forwarding sysctl(8) variable to non-zero.

SEE ALSO

     gif(4), inet(4), ip(4), me(4), netintro(4), protocols(5), ifconfig(8), sysctl(8)

     A description of GRE encapsulation can be found in RFC 2784 and RFC 2890.

AUTHORS

     Andrey V. Elsukov <ae@FreeBSD.org>
     Heiko W.Rupp <hwr@pilhuhn.de>

BUGS

     The current implementation uses the key only for outgoing packets.  Incoming packets with a different key or without a key will be treated as
     if they would belong to this interface.

     The sequence number field also used only for outgoing packets.

BSD
								 November 7, 2014							       BSD
All times are GMT -4. The time now is 10:41 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy