Showing posts with label Unix. Show all posts
Showing posts with label Unix. Show all posts
Friday, April 25, 2025

List folders only - no files

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For future quick reference: I prefer: ls -d */ dir1/ dir2/ di3/ dir4/ Also good: ls -l | grep "^d" drwxr-xr-x ...

What is the reason behind the message: "xauth: file /root/.Xauthority does not exist "?

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What does the message that you sometimes see when attempting to launch X applications on a Linux server "xauth: file /root/.Xauthori...
Sunday, February 19, 2023

How to identified active files/executables when using opatch to deinstall software

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During a opatch rollback operation, we saw the following error message in the opatch logfile: [Feb 19, 2023 2:29:51 PM] [INFO] Prerequi...
Tuesday, July 5, 2022

How to list all nfs mountpoints

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findmnt -t nfs TARGET SOURCE FSTYPE OPTIONS /u01 pzl2ora1:/Oracle/software/pzh0oric/u01 nf...
Wednesday, December 8, 2021

How to add a string to specific line in a text file

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Here is an example of how I inserted a line needed in a postgres pg_restore command, at line 20: sed -i '20s/^/SET search_path to sale...

How to replace a specific string in a very large text file

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Here is how I removed the string "public." from a 4G file: sed -i 's/public\.//g' mylargetextfile.txt Notice the forwar...
Friday, October 29, 2021

How to exctract a specific file from a .tar file

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Say I would like to extract an old version of the oracle inventory, packed in a tar file called "oracle.tar". Change directory t...
Wednesday, May 12, 2021

How to repeat a command for all the lines i a text file using vi

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This is a handy command for all those using the vi editor to fix scripts with many lines. For example, I had to create statements like ...
Wednesday, April 14, 2021

How to change ownership of a symlink in unix

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As pointed out in a post on StackExchange.com : On a Linux system, when changing the ownership of a symbolic link using chown, by default...
Friday, December 4, 2020

How to view the contens of a zip file without extracting it

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Method 1: zip -sf myzipfile.zip Method 2: zipinfo myzipfile.zip
Thursday, October 15, 2020

How to select a specific line number using awk

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The file clonetext.txt contains: Clone Volume: true Clone Parent server Name: myserver1-cluster49 ...
Monday, August 31, 2020

How to zip files in the current directory

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In its simplest form, to zip a number of similary named files, use this syntax: zip client_sql_trace client*.trc where the resulting zi...
Tuesday, August 20, 2019

How to add a semicolon (or any other character) at the end of a line using vi

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Open your text file in vi, and type :%s/$/;/g this will add a semicolon at the end of each line in your file.
Sunday, May 26, 2019

How to display Linux kernel and version information on debian platforms

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Use the lsb (Linux Standard Base) utility: lsb_release -a Output: No LSB modules are available. Distributor ID: Ubuntu Description: Ubunt...
Thursday, January 31, 2019

last - show listing of last logged in users

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A potentiall very useful tool when investigating what really happened, is the command "last". Here is an abbrivated output: ro...

The shell variable HISTTIMEFORMAT and the "history" command

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If you need to investigate the history of commands on your linux/Unix server, set the HISTTIMEFORMAT parameter first: HISTTIMEFORMAT=...
Monday, December 10, 2018

How to send a file to a specific directory using wget

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Here demonstrated while getting a file from our RH satellite server: wget -P /home/oracle/myfiles http://satellite/oracle/cloningscripts/p...
Wednesday, March 14, 2018

How to recursively zip a folder and its subfolders and add password protetion+encryption

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Below I am compressing all files and subfolders in the folder /home/oracle/outputfiles: cd /home/oracle/outputfiles zip -r --encrypt myzi...
Tuesday, January 30, 2018

How to display processes in Linux in a tree-like fashion

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The simplest way to see operating system processes and their sub-processes is to use ps aufx Output will look something like the followi...
Friday, December 1, 2017

How to match an exact string using grep

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grep -w string See it in use here