Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: How to make a loop to read the input from a file part by part?
Top Forums UNIX for Beginners Questions & Answers How to make a loop to read the input from a file part by part? Post 303038091 by arun_adm on Saturday 24th of August 2019 04:02:45 PM
Old 08-24-2019
How to make a loop to read the input from a file part by part?
Hi All,

We've a VDI infrastructure in AWS (AWS workspaces) and we're planning to automate the process of provisioning workspaces. Instead of going to GUI console, and launching workspaces by selecting individual users is little time consuming. Thus, I want to create them in bunches from AWS CLI (installed on centos 7). To achieve this I've created below shell script to launch the workspaces from CLI with least efforts. Please note, the ws-userlist.txt has a list of 60 users, one word per line.

Code:
for i in `cat ws-userlist.txt`;do command-to-create-workspaces DirectoryId=<directoryID>,UserName=$i,BundleId=<bundleID>;done

Now, here, there is a limitation of above workspace creation command. It can only build maximum 25 workspaces at one execution. I wonder if there any way to make the loop read the ws-userlist.txt in such a way that it read the first 25 users and take it as input for the command and execute it. once the it get executed, loop should go back to the input file, and read next set of 25 users and execute the command. Once it get executed, loop again go back to input file, and read the last 10 usernames and run the command.
Please note, username count could vary.Sometime I may have a list of 30, sometimes it could be 55.

I've basic knowledge of shell scripting. Need your expert help on this.
Thanks in advance.
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

read in part of the file into another file

Hi, I justs started learning Unix on my own. I have a question: What command can I use when I need to read in part of the file into another file? I remember I saw it somewhere but I don't know what it is. Thanks (3 Replies)
Discussion started by: whatisthis
3 Replies

2. Shell Programming and Scripting

comparing part of header with part of detailed records.

Hi there, I am lil confused with the following issue. I have a File, which has the following header: IMSHRATE_043008_101016 a sample detailed record is :9820101 A982005000CAVG030108000000000000010169000MAR 2008 9820102 MAR 2008 D030108 ... (1 Reply)
Discussion started by: cmaroju
1 Replies

3. UNIX for Dummies Questions & Answers

Replacing part of a text file with user input.

Ok, I am brand new to UNIX and I am trying to learn a cross between basic script and database use. I had got some ideas off the net on simple ideas for learning UNIX. I am working on creating a simple phone book program that allows myself to enter our employees from work into a phone book text... (0 Replies)
Discussion started by: georgefurbee
0 Replies

4. Shell Programming and Scripting

How to select or make reference to, part of a field

For a field format such as AAL1001_MD82, how do I select(and use in if statement) only the last four elements( in this case MD82) or the first three elements (in this case AAL)? For instance, how do I do the following - if first three elements of $x == yyy, then ... (5 Replies)
Discussion started by: akshaykr2
5 Replies

5. Shell Programming and Scripting

To Read a File and Insert a part of the lines into the database

Hi Guys I need to have a shell script which reads a log file and insert a part of each line into the database. Some sample lines in the file are as below. 20091112091359 MED_RQACK : user_data=60173054304,100232120,20091112091359,;ask_status=0;ask_reason=OK;msg_id=20091112091319... (5 Replies)
Discussion started by: Somanadh
5 Replies

6. Shell Programming and Scripting

[Solved] Printing a part of the last line of the specific part of a file

Hi, I have 80 large files, from which I want to get a specific value to run a Bash script. Firstly, I want to get the part of a file which contains this: Name =A xxxxxx yyyyyy zzzzzz aaaaaa bbbbbb Value = 57 This is necessary because in a file there are written more lines which... (6 Replies)
Discussion started by: wenclu
6 Replies

7. Shell Programming and Scripting

make loop from input file

Hi Guys, I have file A.txt PP97 PP66 PP87 PP66 PP47 PP57 PP44 PP20 PP66 PP16 PP13 PP51 PP68 PP70 PP75 PP30 (2 Replies)
Discussion started by: asavaliya
2 Replies

8. Shell Programming and Scripting

Use while loop to read file and use ${file} for both filename input into awk and as string to print

I have files named with different prefixes. From each I want to extract the first line containing a specific string, and then print that line along with the prefix. I've tried to do this with a while loop, but instead of printing the prefix I print the first line of the file twice. Files:... (3 Replies)
Discussion started by: pathunkathunk
3 Replies

9. Shell Programming and Scripting

Read file and add it into part of file

Hello let me explain senario. there is a file which name is config and it store main software variable: file main.conf contents: update="1" log_login="0" allow_ports="" deny_ports="21,22,23" and there is a file which name is ports.txt file ports.txt contents: 25,26,27 i... (3 Replies)
Discussion started by: nimafire
3 Replies

10. Shell Programming and Scripting

Read file input in while loop does not work on AIX system

I'm working on Aix 6.1 and using ksh shell. The below works fine on Linux bash or ksh shell . while IFS= read -r dirpath ; do echo "Hi" done <<<"$var" However, any such while loop that reads the input from file or variable using <<< fails on Aix system with the below error: Below... (2 Replies)
Discussion started by: mohtashims
2 Replies

LEARN ABOUT DEBIAN

s3rm

S3RM(1p)						User Contributed Perl Documentation						  S3RM(1p)

NAME

       s3rm - Delete Amazon AWS S3 items

SYNOPSIS

       s3rm [options] [bucket/item ...]

	Options:
	  --access-key	  AWS Access Key ID
	  --secret-key	  AWS Secret Access Key
	Environment:
	  AWS_ACCESS_KEY_ID
	  AWS_ACCESS_KEY_SECRET

OPTIONS

       --help  Print a brief help message and exits.

       --man   Prints the manual page and exits.

       --verbose
	       Print a message for each created bucket.

       --access-key and --secret-key
	       Specify the "AWS Access Key Identifiers" for the AWS account.  --access-key is the "Access Key ID", and --secret-key is the "Secret
	       Access Key".  These are effectively the "username" and "password" to the AWS account, and should be kept confidential.

	       The access keys MUST be specified, either via these command line parameters, or via the AWS_ACCESS_KEY_ID and AWS_ACCESS_KEY_SECRET
	       environment variables.

	       Specifying them on the command line overrides the environment variables.

       --secure
	       Uses SSL/TLS HTTPS to communicate with the AWS service, instead of HTTP.

ENVIRONMENT VARIABLES

       AWS_ACCESS_KEY_ID and AWS_ACCESS_KEY_SECRET
	       Specify the "AWS Access Key Identifiers" for the AWS account.  AWS_ACCESS_KEY_ID contains the "Access Key ID", and
	       AWS_ACCESS_KEY_SECRET contains the "Secret Access Key".	These are effectively the "username" and "password" to the AWS service,
	       and should be kept confidential.

	       The access keys MUST be specified, either via these environment variables, or via the --access-key and --secret-key command line
	       parameters.

	       If the command line parameters are set, they override these environment variables.

CONFIGURATION FILE

       The configuration options will be read from the file "~/.s3-tools" if it exists.  The format is the same as the command line options with
       one option per line.  For example, the file could contain:

	   --access-key <AWS access key>
	   --secret-key <AWS secret key>
	   --secure

       This example configuration file would specify the AWS access keys and that a secure connection using HTTPS should be used for all
       communications.

DESCRIPTION

       Delete items in the Amazon Simple Storage Service (S3).

BUGS

       Report bugs to Mark Atwood mark@fallenpegasus.com.

       Occasionally the S3 service will randomly fail for no externally apparent reason.  When that happens, this tool should retry, with a delay
       and a backoff.

       Access to the S3 service can be authenticated with a X.509 certificate, instead of via the "AWS Access Key Identifiers".  This tool should
       support that.

       It might be useful to be able to specify the "AWS Access Key Identifiers" in the user's "~/.netrc" file.  This tool should support that.

       Some errors and warnings are very "Perl-ish", and can be confusing.

AUTHOR

       Written by Mark Atwood mark@fallenpegasus.com.

       Many thanks to Wotan LLC <http://wotanllc.com>, for supporting the development of these S3 tools.

       Many thanks to the Amazon AWS engineers for developing S3.

SEE ALSO

       These tools use the Net::Amazon:S3 Perl module.

       The Amazon Simple Storage Service (S3) is documented at <http://aws.amazon.com/s3>.

perl v5.10.0							    2009-03-08								  S3RM(1p)
All times are GMT -4. The time now is 02:46 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy