How to disable visual mode on mouse select for vim
If selecting text with the mouse in vi enters visual mode, it can cause copy-and-paste problems. To prevent visual mode, create or edit vi ~/.vimrc and add set…
EXPLORE THE TOPIC
Shell & scripting.
23 articles on this topic
How to convert string to lower case
There are several ways to convert uppercase strings to lowercase in Bash: tr, awk, Bash 4.0 expansion, or Perl.
How to get a day before current time in Bash
Use date with -d in Bash to display yesterday's date or an earlier date.
How to trim space from bash variable
A small Bash shell tip: remove trailing spaces, leading spaces, or both from a variable with sed.
How to count blank lines and non-blank lines in a file
Shell techniques for counting blank and nonblank lines in a file, useful in scripts and troubleshooting.
How to redirect stdout and stderr to log file
How to redirect standard output and standard error to a log file. Correct syntax: command > /path/to/log 2>&1. This redirects stdout to the log and stderr to stdout.
If / else statements on bash script
An overview of if/else statements in Bash scripts and comparison conditions. Basic if syntax: if [ condition ] then ... fi.
Monitor multiple logs in a single shell with MultiTail
tail is widely used for viewing logs in real time (tail -f /var/log/logfile). MultiTail provides similar functionality with multiple windows in one console.
Bash Autocomplete feature on CentOS Linux
Bash autocompletion makes Linux work much more convenient. For me it is essential because it makes commands quicker to use.
How to fix "unary operator expected error" in bash script
If testing a shell script produces [: =: unary operator expected error, check the if condition on the reported line to see whether the variable has a value and whether the code…
How to extract a single file / directory from tar archive
On UNIX or Linux, you can extract selected files or directories from a tarball without first extracting everything. This is more convenient and saves space…
How to redirect stderr and stdout to a file
Managing output is a common task in Linux. Commands often redirect errors and output to files so they can be stored and inspected later, especially commands…
How to set a crontab to run command on the last day of every month.
Linux crontab alone cannot specify the last day of a month or its first Saturday. These scripts add that control to scheduled commands.
How to broadcast a message to all users and direct message to some user
Administrators have several ways to send messages to users logged in to a text-mode system. This article covers broadcasting to all users and sending directly to one user.
Disable the auto complete feature of the BASH shell
One advantage of Bash is auto-completion, which saves typing every character of a command or filename. This article covers two ways to disable it…
Show line numbers in vi/vim editor.
Sometimes you need to find a specific line in a file, such as one identified by an error log. vi/vim can easily display or hide line numbers.
View the commented lines of text in a config file
Use grep to display configuration lines that begin with particular characters. This helps inspect comments and review configuration settings.
Resize multiple image files using command-line tools
This article may be useful to webmasters. It covers Linux commands for resizing JPEG, TIFF, PNM, GIF, and other Photo CD image formats. The procedure is straightforward…
Extract files from an RPM package
RPM (Red Hat Package Management) packages are installation files for Red Hat Linux distributions. They are popular because software is easy to install and remove.
Change the behavior of the copy (cp) command overwrite the existing file without prompt
Edit $HOME/.bashrc, because Red Hat adds alias cp='cp -i'. Thus the -r option has no effect. Comment out alias cp='cp -i' with #, then log out and log back in…
Using the man command
The previous article covered whatis and --help. This article explains how to read command manuals with man and search related entries with man -k or apropos.
Make dd give a progress report.
Many of you have probably used dd, but it does not show how far it has progressed. This article explains how to view dd's progress.
Some help, please!
Some people may think help tools are unimportant, but I find them essential when I do not know what a command does, how to use it, or which parameters a file accepts.