Linux command to output from a string Post: 302700525

10 More Discussions You Might Find Interesting

1. Programming

How to Run a Linux Command and Redirect its output to a socket in C

I have a Linux socket server program. I need to run the commands sent by the client and return the output to client. Is there a quicker way? I tried with ptr=popen(command, "r"); and then fgets(buf, size,ptr); write buf to socket fgets hangs for me. Now, I would like to know if I can...

2. Shell Programming and Scripting

grep only a string on command output

How can I grep exactly a string that has .,/ characters using grep? Example: I want to grep ONLY string1 and not string1.more or string1.more.evenmore #lsauth ALL|grep 'string1' All output: string1 <--- This is the only I want. string1.more string1.evenmore. more.string1...

3. Shell Programming and Scripting

Command output string manipulation possible in one line?

This has been bothering me for 3 days. $> hostname cepsun64amd And I just want "cepsun", I would normally do h=`hostname`; ${h%%64*} But I am looking for a one-liner just for my own knowledge, because if there is a way to do this, I should know it by now. Anyway, so is this...

4. UNIX for Dummies Questions & Answers

linux sort command produces strange output

cat a .a ba .b bb .c bc sort a .a .b ba bb bc .c NOTE: .a and .b appears before ba and bb, where as .c appears after bc. In general

5. Shell Programming and Scripting

Grep command showing wrong output in Linux

Hi All I am trying to run a script in linux wherein i have a command like this grep ^prmAttunityUser= djpHewr2XFMAttunitySetup_ae1_tmp djpHewr2XFMAttunitySetup_ae1_tmp is a temporary file in which the user value is stored but this command in the script returns me balnk value whereas it has a...

6. UNIX for Dummies Questions & Answers

LINUX - How to remove the final delimiter from a command output

Hi All, I am trying to list the various dates for which the file is available in a directory using the command below, (& subsequently pass the command output to a loop) Command : ls dir|grep 'filename'|cut -d '_' -f1|cut -c1-8|tr '\n' ',' However, it is giving me an extra comma...

7. Shell Programming and Scripting

Want to terminate command execution when string found in the command output

Hi Experts, I am very much new to linux scripting, I am currently working on reducing my manual work and hence writing a script to automate few task. I am running below command to snmpwalk the router.. snmpwalk -v 3 -u WANDL_SU -a MD5 -A vfipmpls -x DES -X VfIpMpLs -l authPriv...

8. Shell Programming and Scripting

Different output for awk command on Linux & HP-UX

I am using an awk command to extract a particular portion of a string. Below is the command and its output on a Linux system: oracle@host1:/tmp (/home/oracle) $uname -a Linux host1 2.6.32-279.39.1.el6.x86_64 #1 SMP Fri Nov 15 05:38:26 EST 2013 x86_64 x86_64 x86_64 GNU/Linux ...

9. Shell Programming and Scripting

Help with Passing the Output of grep to sed command - to find and replace a string in a file.

I have a file example.txt as follows :SomeTextGoesHere $$TODAY_DT=20140818 $$TODAY_DT=20140818 $$TODAY_DT=20140818I need to automatically update the date (20140818) in the above file, by getting the new date as argument, using a shell script. (It would even be better if I could pass...

10. UNIX for Beginners Questions & Answers

Interpreting Linux's free command output

I have two questions on Linux's free command. Below, I have provided output from my home laptop (fedora 26 ) which has 16GB Physical RAM and a production server (RHEL 7.4) which has 24GB RAM. Question1. What exactly does the buffer/cache column say in free command's output ? buffer/cache is...

LEARN ABOUT CENTOS

arp2ethers

ARP2ETHERS(8)						      System Manager's Manual						     ARP2ETHERS(8)

NAME

       arp2ethers - convert arpwatch address database to ethers file format

SYNOPSIS

       arp2ethers

DESCRIPTION

       arp2ethers converts file arp.dat in the current directory into ethers(5) format on stdout.  Usually arp.dat is an ethernet/ip database file
       generated by arpwatch(8).  The arpwatch daemon in Debian will create different arp.dat depending on its configuration. All of them will	be
       available at /var/lib/arpwatch/.

FILES

       /var/lib/arpwatch - default directory for arp.dat
       arp.dat - ethernet/ip address database

SEE ALSO

       arpwatch(8), ethers(5), rarp(8), arp(8),

BUGS

       Please send bug reports to arpwatch@ee.lbl.gov.

AUTHORS

       Original  version  by  Craig Leres of the Lawrence Berkeley National Laboratory Network Research Group, University of California, Berkeley,
       CA.

       Modified for the Debian Project by Peter Kelemen, with additions from Erik Warmelink.

       The current version is available via anonymous ftp:

	      ftp://ftp.ee.lbl.gov/arpwatch.tar.gz

       This manual page was contributed by Hugo Graumann.

																     ARP2ETHERS(8)

10 More Discussions You Might Find Interesting

1. Programming

How to Run a Linux Command and Redirect its output to a socket in C

Discussion started by: rajeshomallur

2. Shell Programming and Scripting

grep only a string on command output

Discussion started by: iga3725

3. Shell Programming and Scripting

Command output string manipulation possible in one line?

Discussion started by: Ryan.

4. UNIX for Dummies Questions & Answers

linux sort command produces strange output

Discussion started by: ajb