Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Shell Script that reads a file
Top Forums Shell Programming and Scripting Shell Script that reads a file Post 302973948 by neutronscott on Tuesday 24th of May 2016 10:03:16 AM
Old 05-24-2016
while executes commands as long as a test succeeds.

read will not succeed at EOF from taskfile.txt and the loop will stop.

if the last line is not in fact a line (it doesn't end with \n), then you will reach EOF before read reaches the delimiter. An example:

Code:
mute@zbox:~$ printf '1\n2\n3' > file
mute@zbox:~$ while read -r a b c; do echo "$a"; done < file
1
2
mute@zbox:~$

Text files by definition should end with a newline, but if this is the problem you need to work around you can try entering your loop again with a test like this:

Code:
mute@zbox:~$ while read -r a b c || [[ $a ]]; do echo "$a"; done < file
1
2
3

 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

sh script that reads/writes based upon contents of a file

Hi everyone, Ive got a quick question about the feasibility and any suggestions for a shell script. I can use sh or ksh, doesnt matter. Basically, Ive got an output file from a db2 command that looks like so: SCHEMA NAME CARD LEAF ELEAF LVLS ISIZE NDEL KEYS F4 F5 ... (3 Replies)
Discussion started by: rdudejr
3 Replies

2. Shell Programming and Scripting

Shell script that reads from configuration file to get database

Hi intelligent beings, I am trying to write a script that 1. Accepts the following arguments: store_number div_number user_id div_code 2. Will read from a configuration file to get the Database 3. Use the div_code to determine which value to retrieve from the configuration file ... (1 Reply)
Discussion started by: dolo21taf
1 Replies

3. Shell Programming and Scripting

passing argument to shell script that reads user inputs

Hi, Lets say I have a script "ss" which does this read abc echo $abc read pqr echo $pqr Now if I want to pass and argument to only "abc" how do I do it. If I do echo "somevalue" | ss, it does not prompt for pqr and its value comes out as blank. Any help is appreciated Thanks P (6 Replies)
Discussion started by: patjones
6 Replies

4. Shell Programming and Scripting

how to read dbf file in shell script and to convert dbf file usinf shell script

Hi all, I am new to shell scripting. I have dbf file and I need to convert it into csv file. OR, can i read the fields from a .dbf file and OR seprate the records in dbf file and put into .csv or txt. Actually in the .dbf files I am getting , the numbers of fields may vary in very record and... (6 Replies)
Discussion started by: gauara
6 Replies

5. Shell Programming and Scripting

script that reads all the scripts in the directory and run them within that script

Hi I am trying to write a shell script that is reading all the scripts in the current directory (currently 5) and is allowing me to run the scripts that is in the directory. I want that this scripts asks te user to execute 1 of the listed scripts. I have 4 sample scripts in the directory:... (8 Replies)
Discussion started by: I-1
8 Replies

6. Shell Programming and Scripting

script that reads a value and send an email on 89th day

hi all, Currently in my system a user's password expires after 90 days and the last passsword change time is stored in an attribute pwdchange date. i need a linux script that read this attribute and add 89 days and send an email that the user password is expiring the next day. i can store... (1 Reply)
Discussion started by: manankapoor
1 Replies

7. UNIX for Dummies Questions & Answers

Difference between buffered disk reads and cached reads?

I was analyzing the Disk read using hdparm utility. This is what i got as a result. # hdparm -t /dev/sda /dev/sda: Timing buffered disk reads: 108 MB in 3.04 seconds = 35.51 MB/sec # hdparm -T /dev/sda /dev/sda: Timing cached reads: 3496 MB in 1.99 seconds = 1756.56 MB/sec... (1 Reply)
Discussion started by: pinga123
1 Replies

8. Shell Programming and Scripting

Help with script that reads and writes java console Minecraft

Hi I am looking for an easy way to lock game mode (0) for everyone included op on a Minecraft server. It can be a script that every time a player changes game to 1 the script changes back to 0. What the player writes is visible in the java console. I am not good at script programming and my... (0 Replies)
Discussion started by: MyMorris
0 Replies

9. UNIX for Dummies Questions & Answers

Sudo reads password from a .cfg file

cleanwork /saswork removes sas orphanded processes in the saswork directory. Subdirectories under sasem are sas94, sas92 and sasworks . I am getting the following error messages: 1. '/usr/bin/sudo -S apt-get update <~/opt/SiM/pos/ps/db_auth.cfg... (4 Replies)
Discussion started by: dellanicholson
4 Replies

10. Shell Programming and Scripting

Help with Shell Scrip in Masking particular columns in .csv file or .txt file using shell script

Hello Unix Shell Script Experts, I have a script that would mask the columns in .csv file or .txt file. First the script will untar the .zip files from Archive folder and processes into work folder and finally pushes the masked .csv files into Feed folder. Two parameters are passed ... (5 Replies)
Discussion started by: Mahesh G
5 Replies

LEARN ABOUT CENTOS

amanda-scripts

AMANDA-SCRIPTS(7)						    Miscellanea 						 AMANDA-SCRIPTS(7)

NAME

       amanda-scripts - Configuring and using the Script API

DESCRIPTION

       The Script API is a flexible system for invoking user-supplied scripts at various points in the execution of Amanda. This manual page
       describes the operation and configuration of the API. For help writing Script API scripts, see http://wiki.zmanda.com/index.php/Script_API.

SCRIPTS

       This section lists the scripts included with Amanda, see the individual man page for instructions on using them. For complete How-To
       information, consult the Amanda wiki at http://wiki.zmanda.com.

       o   amzfs-snapshot(8), - create/destroy zfs snapshot.

       o   script-email(8), - send email.

       Script properties work just like application properties: they are insensitive to case, and - (dash) and _ (underscore) may be used
       interchangeably.

SCRIPTS OUTPUT PROPERTY

       A pre-dle-amcheck, pre-dle-estimate or pre-dle-backup executed on the client can output property on stdout that are sent to the
       application. If the output line matches "PROPERTY str1 str2", Amanda sets a property called "str1" by the value of "str2", that property is
       sent to the application.

SEE ALSO

       amanda(8), amanda.conf(5)

       The Amanda Wiki: : http://wiki.zmanda.com/

AUTHORS

       Jean-Louis Martineau <martineau@zmanda.com>
	   Zmanda, Inc. (http://www.zmanda.com)

       Dustin J. Mitchell <dustin@zmanda.com>
	   Zmanda, Inc. (http://www.zmanda.com)

Amanda 3.3.3							    01/10/2013							 AMANDA-SCRIPTS(7)
All times are GMT -4. The time now is 12:54 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy