Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

Strange behavior of grep

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Strange behavior of grep
# 8  
Old 09-22-2014
You're right of course, good point Smilie
# 9  
Old 09-22-2014
Excluding the record with the process ID of the script should also do the trick:

Code:
...| grep -v $$ |...

# 10  
Old 09-23-2014
$$ can be a small number.
Better grep -vw $$.
Also some shells can spawn sub processes with a different PID, without updating $$,
then the $$ would not match grep's PPID.
Login or Register to Ask a Question

Previous Thread | Next Thread

9 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Strange Ctrl+C behavior

Hello All, I have a strange issue. I've created a shell script which connects to RMAN (Oracle Recovery Manager) and executes full DB backup. I then executed this script with nohup and in the background: $ nohup my_script.sh > logfile.log 2>&1 &The issue is that when I tried to take a look into... (6 Replies)
Discussion started by: JackK
6 Replies

2. AIX

Strange behavior with tar

I am trying to create an archive using tar. I am specifying a list of directories using the -L option. For testing purposes I created a simple directory structure: /backup/test /backup/test/test1 /backup/test/test2 The file specified by the -L option, named files.txt, contains:... (8 Replies)
Discussion started by: judykstra
8 Replies

3. Red Hat

strange mail behavior

Hi I have script to to take backup and send mail to a group once a day. One strange behavior I have observed recently is that most of the time the mail we receive is fine . But someday it just sends out mail without any subject with undisclosed recipients. I dont know how to find the cause... (0 Replies)
Discussion started by: ningy
0 Replies

4. Ubuntu

Ubuntu strange behavior

It is so till login screen. I mean that when I boot my computer, Ubuntu shows a splash screen with mouse instead of Ubuntu logo and in the login screen it shows XUbuntu login screen... It began when I upgraded to previous kernel, I suppose, but I'm not sure... I can't say that it annoys me very... (6 Replies)
Discussion started by: Sapfeer
6 Replies

5. Programming

Strange behavior in C++

I have the following program: int main(int argc, char** argv){ unsigned long int mean=0; for(int i=1;i<10;i++){ mean+=poisson(12); cout<<mean<<endl; } cout<<"Sum of poisson: "<< mean; return 0; } when I run it, I get the... (4 Replies)
Discussion started by: santiagorf
4 Replies

6. Shell Programming and Scripting

nawk strange behavior

Dear guys; when deleting repeated lines using nawk as below ; Why the below syntax works? nawk ' !a++' infile > outfile and when using the other below syntax the nawk doesn't work? nawk ' { !a++ } ' infile > outfile or nawk ' { !a++ } ' infile > outfile BR (4 Replies)
Discussion started by: ahmad.diab
4 Replies

7. Shell Programming and Scripting

Very Strange Behavior for redirection

I have searched far and wide for an explanation for some odd behavior for output redirection and haven't come up with anything. A co-worker was working on old scripts which have run for years and embedded in their code were output redirects which worked for the script during execution and then... (5 Replies)
Discussion started by: cahook
5 Replies

8. UNIX for Dummies Questions & Answers

Strange Behavior on COM2

Hi, I have a problem with a new touch screen controller that I am trying to use on a SCO 3.0 system. THe touch screen controller only wants to talk at 9600baud. I have updated /etc/inittab per the manual and also edited /usr/lib/event/devices to use 9600 baud. The only way I can get the... (0 Replies)
Discussion started by: Elwood51
0 Replies

9. UNIX for Dummies Questions & Answers

strange sed behavior

I have a file called products.kp which contains, for example, 12345678,1^M 87654321,2^M 13579123,3 when I run the command cat products.kp| sed -f kp.sed where kp.sed contains s,^M,, I get the output 12345678,1 87654321,2 13579123,3 (5 Replies)
Discussion started by: Kevin Pryke
5 Replies
Login or Register to Ask a Question