Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Create Dynamic if condition
Top Forums Shell Programming and Scripting Create Dynamic if condition Post 302943656 by RudiC on Monday 11th of May 2015 02:23:32 PM
Old 05-11-2015
Quote:
Originally Posted by RudiC
With a recent bash, try
Code:
[[ "$(tail -${LEFT_OVR} color.txt | tr '\n' ' ' )" =~ "$color" ]] && echo good || echo bad

Quote:
Originally Posted by wahi80
Hi,
Can you explain, how above command works, in building the if condition?
That is an "abbreviated if construct" in recent bash (and other recent shells). If the result of the [[ ... ]] compound command is true, the && command is executed, if false, the || command.
cf. man bash :
Quote:
An additional binary operator, =~, is available... When it is used, the string to the right of the operator is considered an extended regular expression and matched accordingly.
So above looks for the $color in the string built from the LEFT_OVR lines tailed from the file.
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

How to create a dynamic list?

Hi falks, I need to write a function in k-shell which cd to root directory and ask the user which sub directory you want to tar. The user will select directories untill quit. How to do it? Thanks in advance, Nir (4 Replies)
Discussion started by: nir_s
4 Replies

2. Shell Programming and Scripting

how to create folder wen the condition satisfied

hi i hav files ha1j ha2m ha3n ha4q ha5s ...like tat im having some 20 files ..and i want to create a folder as the same amount of files which im having wen the condition if loop is satisfied .. thank you (5 Replies)
Discussion started by: maximas
5 Replies

3. UNIX for Advanced & Expert Users

Sql dynamic table / dynamic inserts

I have a file that reads File (X.txt) Contents of record 1: rdrDESTINATION_ADDRESS (String) "91 971502573813" rdrDESTINATION_IMSI (String) "000000000000000" rdrORIGINATING_ADDRESS (String) "d0 movies" rdrORIGINATING_IMSI (String) "000000000000000" rdrTRAFFIC_EVENT_TIME... (0 Replies)
Discussion started by: magedfawzy
0 Replies

4. Shell Programming and Scripting

create separate file after checking condition..

Problem : I want to create a separate file for country list if condition is true. Please help. ***************************************************** Input file: SV-INCR-139302-365540488-201104090934.sqllog SV-INCR-1082-552793184-201104040805.sqllog SV-INCR-1077-855045741-201104040805.sqllog... (4 Replies)
Discussion started by: humaemo
4 Replies

5. Shell Programming and Scripting

redirect stdout echo command in condition A run in condition B

hi, I have some problems in my simple script about the redirect echo stdout command inside a condition. Why is the echo command inside the elif still execute in the else command Here are my simple script After check on the two diff output the echo stdout redirect is present in two diff... (3 Replies)
Discussion started by: jao_madn
3 Replies

6. UNIX for Dummies Questions & Answers

Create a condition for a non-included string

hey, just want to ask how to check this scenario a="apple banana cherry" if egg=0 fi how do you do the condition? thanks! (2 Replies)
Discussion started by: h0ujun
2 Replies

7. Shell Programming and Scripting

Help Create dynamic ksh script from a script

I am currently running 2 scripts to gather data for a 3rd script and would like to combine the 2 scripts into one. Having issues with the final output format. Note cannot post URL so replaced the http stuff with (name) in the examples All scripts contain #!/bin/ksh OS = Red Hat Enterprise... (0 Replies)
Discussion started by: pcpinkerton
0 Replies

8. Shell Programming and Scripting

Create, validate and using dynamic variables in Bash scripting

Hi All, I am really struggling to solve this problem, this might be small but I am not able to, can somebody help me? I have few directories and these directories receives text files in large amount with in fraction of seconds. So I just want to send all the files in current directory to... (2 Replies)
Discussion started by: VasuKukkapalli
2 Replies

9. UNIX for Dummies Questions & Answers

Create a file on UNIX with multiple columns on certain condition

I need to write the list of files to a new file in one column , the second column would contain the first line of that file (header record extracted through head -1 ) and the third column would contain the last record of that file (trailer record tail -1 ) . Example :- folder where the files... (8 Replies)
Discussion started by: IshuGupta
8 Replies

10. UNIX for Advanced & Expert Users

How to create folder by using if and elif condition?

Hi All, I have already code to create folder for one country let say US , now we want to create folder/directory for JP country also using shell script , application server. $COUNTRY='US' if ] then if mkdir -m 777 -p /opt/TEST/$COUNTRY/$INVOICE >/dev/null 2>&1 | tee -a ... (5 Replies)
Discussion started by: Boost
5 Replies

LEARN ABOUT MINIX

ppmtopgm

ppmtopgm(1)                                                   General Commands Manual                                                  ppmtopgm(1)

NAME

       ppmtopgm - convert a portable pixmap into a portable graymap

SYNOPSIS

       ppmtopgm [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as  input.  Produces a portable graymap as output.  The output is a "black and white" rendering of the original
       image, as in a black and white photograph.  The quantization formula used is .299 r + .587 g + .114 b.

       Note that although there is a pgmtoppm program, it is not necessary for simple conversions from pgm to ppm , because any  ppm  program  can
       read  pgm  (and  pbm  ) files automatically.  pgmtoppm is for colorizing a pgm file.  Also, see ppmtorgb3 for a different way of converting
       color to gray.  And ppmdist generates a grayscale image from a color image, but in a way that makes it easy to differentiate  the  original
       colors, not necessarily a way that looks like a black and white photograph.

QUOTE

       Cold-hearted orb that rules the night
       Removes the colors from our sight
       Red is gray, and yellow white
       But we decide which is right
       And which is a quantization error.

SEE ALSO

       pgmtoppm(1),ppmtorgb3(1),rgb3toppm(1),ppmdist(1),ppm(5),pgm(5)

AUTHOR

       Copyright (C) 1989 by Jef Poskanzer.

                                                                   10 April 2000                                                       ppmtopgm(1)
All times are GMT -4. The time now is 05:26 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy