understanding the purpose of <If env | grep -q $EXAMPLE> Post: 303041873

Sponsored Content

Top Forums Shell Programming and Scripting understanding the purpose of <If env | grep -q $EXAMPLE> Post 303041873 by croyleje on Thursday 5th of December 2019 02:39:36 PM

12-05-2019

Registered User

understanding the purpose of <If env | grep -q $EXAMPLE>

I have seen this code in a few places and my understanding is they are using it to determine what app called the script.

I have a script that is called by two different applications and what it to do one thing when called by one and something else when called by the other. How do I determine what app is calling the script? If my example is correct how would I determine the $EXAMPLE and is every running application assigned a variable name?

I thought about just writing a separate script but the script is caching some info from one app and then echoing out to the other app when it asks for it so I think it should stay as one script.

Any help or pointing me in the correct direction would be great.
Thank you,
Jason

croyleje

View Public Profile for croyleje

Find all posts by croyleje

10 More Discussions You Might Find Interesting

1. Programming

Understanding the purpose of dup/dup2

I'm having difficulty understanding the purposes of using dup/dup2 when involving forks. for example, if we call fork() once, that is, we are creating a child process. In what cases would we need to use dup or dup2 to duplicate the file descriptors for standard output and standard error? What...

2. Shell Programming and Scripting

Adding command line env in cron env

Hello friends, i run two scripts manually & they work. i run them in cron & they don work. how to match the two env's 1.command line env 2.cron env i would like cron to use command line env. Thanks & Regards Abhijeet

3. UNIX for Dummies Questions & Answers

Explain the line "mn_code=`env|grep "..mn"|awk -F"=" '{print $2}'`"

Hi Friends, Can any of you explain me about the below line of code? mn_code=`env|grep "..mn"|awk -F"=" '{print $2}'` Im not able to understand, what exactly it is doing :confused: Any help would be useful for me. Lokesha

4. UNIX for Dummies Questions & Answers

Purpose of /etc/cron.d

What is the purpose of /etc/cron.d?

5. UNIX for Advanced & Expert Users

Purpose of inv

Hi All Can anybody tell me what is the purpose of inv in the below command. ftp -inv $RFTPSERVER /temp/te.txt << EOF and << its stands for what.. Thanks

6. Web Development

Deny from env=env-variable Does not work

(Above from Apache docs). On my system, using: SetEnvIf User-Agent Mozilla IsBad=1 Order allow,deny Allow from all Deny from env=IsBad ...I see that environment variable is set (using phpinfo()) but the page is still served. No errors in the Apache logs.

7. Shell Programming and Scripting

Understanding pattern matching used in a grep command

I have the following code. I want to remove the --sort=num/num/... and am using grep to exclude it as shown below: I have a bit of problem figuring out the use of - at the front echo "--sort=4/5/6" | grep -ivE '-((sort|group)=+/+(/+)*)$' Now suppose I want to remove --quiet I can...

8. UNIX for Dummies Questions & Answers

Purpose of <>

Hi, I have read from the book that , <> causes the file to be used as both input as well as output. Can anyone give me the scenario where <> will be useful? Thanks

9. Shell Programming and Scripting

help understanding regex with grep & sed

I have the following line of code that works wonders. I just don't completely understand it as I am just starting to learn regex. Can you help me understand exactly what is happening here? find . -type f | grep -v '^\.$' | sed 's!\.\/!!'

10. Shell Programming and Scripting

Further understanding the Grep! lol

If I use the grep command for parsing files, does it stop parsing right after it finds the matching pattern or does it continue to parse that document? grep -l "status" *.xml

LEARN ABOUT LINUX

zegrep

ZGREP(1)                                                      General Commands Manual                                                     ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep  options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

                                                                                                                                          ZGREP(1)

10 More Discussions You Might Find Interesting

1. Programming

Understanding the purpose of dup/dup2

Discussion started by: Yifan_Guo

2. Shell Programming and Scripting

Adding command line env in cron env

Discussion started by: abhijeetkul

3. UNIX for Dummies Questions & Answers

Explain the line "mn_code=`env|grep "..mn"|awk -F"=" '{print $2}'`"

Discussion started by: Lokesha

4. UNIX for Dummies Questions & Answers

Purpose of /etc/cron.d

Discussion started by: proactiveaditya