Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Egrep ERE to find null
Top Forums Shell Programming and Scripting Egrep ERE to find null Post 302801613 by sydox on Thursday 2nd of May 2013 10:23:57 AM
Old 05-02-2013
Egrep ERE to find null
Hello All,
My apologies if a similar question has already been posted. I searched for "grep", "egrep" and "null"

I'm having an issue with egrep and an extended regular expression.
I'm doing a test for a job name. I would like to have the user enter a job name with no spaces and also test to make sure that they don't accidently hit the return key too fast.
My code:
Code:
echo "Please enter a job name (no spaces): "
read jobname
#  ***test not working*** while [`echo $jobname | egrep '(" "|"^$")' | wc -l -gt 0 ]; do
 
while [`echo $jobname | grep " " | wc -l -gt 0 ] || [`echo $jobname | grep "^$" | wc -l -gt 0 ]; do   # working
echo "Please enter a new job name (NO spaces): "
read jobname
done

The command egrep '(" "|"^$")' isn't working!!! It doesn't give any errors but it never goes through the while statement from any test.
Thanks in advanced!!
 

10 More Discussions You Might Find Interesting

1. Solaris

How to find egrep version on Solaris 10

Hi, How can I find the egrep version installed on Solaris 10 as I don't see any egrep --version option.Also wanted to know which version would support option of -A (eg. egrep -A NUM PATTERN FILE ) Print NUM lines of trailing context after matching lines. Thanks & Regards, Kiran. (6 Replies)
Discussion started by: kiranherekar
6 Replies

2. Shell Programming and Scripting

Find null fields in file

Hi All, I have some csv files out of which i want to find records which have empty values in either the 14th or 16th fields. The following is a sample. $cut -d',' -f14,16 SPS* | head -5 VOIP_ORIG_INFO,VOIP_DEST_INFO sip:445600709315@sip.com,sip:999@sip.com... (2 Replies)
Discussion started by: rahulrathod
2 Replies

3. Shell Programming and Scripting

How can find Null value in If condition

Hi, i wrote If Conditions in my script, it's returns null and some values. but i am unable to find when Null value getting. bec we need modification according null vales. pls help me on this. (2 Replies)
Discussion started by: koti_rama
2 Replies

4. UNIX for Dummies Questions & Answers

Using /dev/null with grep and find

Hi, I am trying to display the filename in which a string was found after using find and grep. For this after some googling I found that this works: find -name "*.java" -exec grep "searchStr" {} /dev/null \; I wanted to know the difference between the above and the following: find -name... (0 Replies)
Discussion started by: gaurav_s
0 Replies

5. Shell Programming and Scripting

Find out if few fields in a file are null

Hi, I've a pipe delimited file where I want to find out a number of lines where 1st 2nd and last field are null using awk/sed. Is it possible? Thanks (5 Replies)
Discussion started by: rudoraj
5 Replies

6. Shell Programming and Scripting

how to find null column

Hi, everyone I have a requirement as following: source file 1, abc, def, caaa 2, , cde, aaa 3, bcd, , adefefg I need find columns which contains null value, in above example, I need get two rows 2, , cde, aaa 3, bcd, , adefefg anybody has idea how to achive this ... (5 Replies)
Discussion started by: ken002
5 Replies

7. Shell Programming and Scripting

egrep help required to find pattern

Hi All, Can some one please help me how to grep the comments from "oracle" & "sybase" code. I would like to grep below type of pattern. -- /* */ Please help. (6 Replies)
Discussion started by: gr8_usk
6 Replies

8. Shell Programming and Scripting

How to find null column?

hi Gurus, I need find the null column in a file. my file like below abc, ,cde,def abc,ded,cdd,def abc, ,ddd,ccd aaa,bbb,ccc,ddd basic, I need to find the lines which second column is null Thanks in advance (3 Replies)
Discussion started by: ken6503
3 Replies

9. Shell Programming and Scripting

To find record having null value

Hi All My requirement is to find the null values in particular column of a file and reject it in case if it contains null values. But the challenge is that I want a common command which can be used across different file, as the position of the column we need to check for different file may get... (14 Replies)
Discussion started by: ginrkf
14 Replies

10. UNIX for Beginners Questions & Answers

Egrep find word that occurs twice in a row

Hi there I am trying to figure out and understand what the syntax would be to egrep lines that have a word occur twice in a row. the two words obviously should have a space between them and also it has to be case sensitive which I believe grep is by deffault. the closest I have come is... grep... (7 Replies)
Discussion started by: spo_2138
7 Replies

LEARN ABOUT SUSE

set_color

set_color(1)                                                           fish                                                           set_color(1)

NAME

       set_color - set_color - set the terminal color

set_color - set the terminal color
   Synopsis
       set_color [-v --version] [-h --help] [-b --background COLOR] [COLOR]

   Description
       Change the foreground and/or background color of the terminal. COLOR is one of black, red, green, brown, yellow, blue, magenta, purple,
       cyan, white and normal.

       o -b, --background Set the background color

       o -c, --print-colors Prints a list of all valid color names

       o -h, --help Display help message and exit

       o -o, --bold Set bold or extra bright mode

       o -u, --underline Set underlined mode

       o -v, --version Display version and exit

       Calling set_color normal will set the terminal color to whatever is the default color of the terminal.

       Some terminals use the --bold escape sequence to switch to a brighter color set. On such terminals, set_color white will result in a grey
       font color, while set_color --bold white will result in a white font color.

       Not all terminal emulators support all these features. This is not a bug in set_color but a missing feature in the terminal emulator.

       set_color uses the terminfo database to look up how to change terminal colors on whatever terminal is in use. Some systems have old and
       incomplete terminfo databases, and may lack color information for terminals that support it. Download and install the latest version of
       ncurses and recompile fish against it in order to fix this issue.

Version 1.23.1                                                    Sun Jan 8 2012                                                      set_color(1)
All times are GMT -4. The time now is 05:44 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy