Entries tagged with macos

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How to ppen a file in a tab in vim in readonly mode on Linux, MacOS and Unix system

Want to open a file in read-only mode on Unix, try:
vim -M file
OR open a tab in read-only mode:
: view file

More info: Open a file or a tab in vim in readonly mode

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curl ignore invalid ssl certificate warning

Want to ignore SSL warning with curl command on Linux/Unix/MacOS? Try:

curl -k url
curl -k -I url

More info: cURL Ignore SSL Certificate Warnings

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The Awk Programming Language for all {PDF version}

AWK is a programming language designed for text processing and typically used for a data extraction and reporting tool. It is a standard feature of Linux, FreeBSD, OpenBSD, MacOS and most Unix-like systems.

Download: The AWK programming book (PDF version)

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Directly attach screen/tmux over ssh session & save a useless parent bash process:

Run the following command:

ssh -t box screen -r
ssh -t box tmux a
ssh -t user@server screen -r
ssh -t user@server tmux a

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How to determine if a bash variable is empty in a Linux or Unix?

My shell script depends upon user input. How do I find out if a variable called $_JAIL path is empty under a Linux / Apple OS X / Unix like operating systems? What is the best way to determine if a variable in bash is empty?

Pass the -z option to the if command or conditional expression.

Read more here