Sponsored Content
Top Forums Shell Programming and Scripting Unix Shell basic loop massive n00b Post 302552109 by Corona688 on Thursday 1st of September 2011 03:54:13 PM
Old 09-01-2011
Check that the length is three. [ "${#STR}" -eq 3 ]

Check that it's all digits. [ -z "${STR/[0-9]*/}" ]

Check that it's not in the file. ! grep $ID user.db #??? not perfect but best I can do without knowing what user.db looks like

So

Code:
STR=""
until [ "${#STR}" -eq 3 ] && [ -z "${STR/[0-9]*/}" ] && ! grep "$STR" user.db > /dev/null
do
         read STR
done

 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Absolute n00b questions about Unix / Linux

Hi All, I have absolutely no experince with either one, and would LOVE to start from somewhere! So please guide me to some web sites (beside these great forums of course!) that I can obtain n00b information. (Books, links, resources, etc.) What software OS? should I begin with? I have heard... (2 Replies)
Discussion started by: CodeHunter
2 Replies

2. UNIX for Dummies Questions & Answers

A basic question of FOR loop

Hi, have a basic query. Please see the below code: list="one two three" for var in $list ; do echo $var list="nolist" Done Wht if I want to print only first/ last line in the list Eg one & three Regards er_ashu (3 Replies)
Discussion started by: er_ashu
3 Replies

3. Shell Programming and Scripting

unix shell basic

need some help badly. if i had a file with content of few lines like the followings. 1183724770.651 0.049 137.157.56.169 200 415 GET http://venus/client/clients.xml "text/xml" 1183724770.651 0.049 141.183.101.250 200 415 GET http://venus/client/clients.xml "text/xml" using what command... (1 Reply)
Discussion started by: akagi07
1 Replies

4. Programming

Creating a basic UNIX shell script for chatting

Hey guys, This is quite simply what I'm trying to make: A program that runs in a UNIX terminal that you can output text messages to from another machine. These text messages would be prepended with a customized prompt. I'd also like to have the window spew out random dumps of flavor text not... (1 Reply)
Discussion started by: AcerAspirant
1 Replies

5. Shell Programming and Scripting

Shell Scripting n00b

Hey Guys! I was hoping for some help with a simple script I'm trying to use. I have the script set up to pull some simple information out of a database .txt file and sed it into a preexisting template for assignment cover letters. The problem seems to be someplace in the sed statement but I... (5 Replies)
Discussion started by: BFeicht
5 Replies

6. Shell Programming and Scripting

Help required on basic Unix Bourne Shell Script

Howdy People :), I'm a newbie & its my first question here. I've started learning Unix Bourne Shell scripting recently and struggling already :p Can someone PLEASE help me with the following problem. Somehow my script is not working. Display an initial prompt of the form: Welcome to... (1 Reply)
Discussion started by: methopoth
1 Replies

7. Shell Programming and Scripting

which is the Very basic certification on unix shell scripting?

Hi, I am very new to this forum, can any one tell me which is the very basic certification on unix shell scripting? please give me an advice on this. (1 Reply)
Discussion started by: Manjesh
1 Replies

8. Shell Programming and Scripting

Shell pipeline help for a n00b

I need to read input from a file, and make sure nothing prints after column 72. basically, ignore input after character 72 until the next newline character. Any help is appreciated. I have been searching forever! (10 Replies)
Discussion started by: Gbear
10 Replies

9. UNIX for Dummies Questions & Answers

Basic loop awk/shell script question..

Hi, Sorry if this is a newbie question. I guess you can use either awk or shell script for this sequence of operations, but knowing very little about either of them I'm not sure how I should try to write this. The basic objective is to copy certain files that are scattered all over my... (10 Replies)
Discussion started by: pc2001
10 Replies

10. Shell Programming and Scripting

Basic FOR loop with break

Oracle Linux : 6.4/bash shell In the below I want to break out of the loop when it enters the 5th iteration. #!/bin/bash for i in 1 2 3 4 5 6 do echo "$i" if echo "Oh Nooo... i = $i. I need to stop the iteration and jump out of the loop" then break fi done But, it only... (3 Replies)
Discussion started by: John K
3 Replies
RECINS(1)							   User Commands							 RECINS(1)

NAME
recins - insert records in a recfile SYNOPSIS
recins [OPTION]... [t TYPE] [-n NUM | -e EXPR | -q STR | -m NUM] [(-f STR -v STR]|[-R RECDATA)]... [FILE] DESCRIPTION
Insert new records in a rec database. -f, --field=STR field name; should be followed by a -v. -v, --value=STR field value; should be preceded by an -f. -r, --record=STR record that will be inserted in the file. --force insert the record even if it is violating record restrictions. --no-external don't use external descriptors. --no-auto don't insert auto generated fields. --verbose give a detailed report if the integrity check fails. -s, --password=STR encrypt confidential fields with the given password. --help print a help message and exit. --version show version and exit. Record selection options: -i, --case-insensitive make strings case-insensitive in selection expressions. -t, --type=TYPE operate on records of the specified type only. -e, --expression=EXPR selection expression. -q, --quick=STR select records with fields containing a string. -n, --number=NUM,... select specific records by position, with ranges. -R, --random=NUM select a given number of random records. If no FILE is specified then the command acts like a filter, getting the data from standard input and writing the result to standard out- put. AUTHOR
Written by Jose E. Marchesi. REPORTING BUGS
Report bugs to: bug-recutils@gnu.org GNU recutils home page: <http://www.gnu.org/software/recutils/> General help using GNU software: <http://www.gnu.org/gethelp/> COPYRIGHT
Copyright (C) 2010, 2011, 2012 Jose E. Marchesi. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
The full documentation for recins is maintained as a Texinfo manual. If the info and recins programs are properly installed at your site, the command info recins should give you access to the complete manual. recins 1.4.93 January 2012 RECINS(1)
All times are GMT -4. The time now is 08:05 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy