The nohup command only writes to nohup.out if the output would otherwise go to the terminal. If you have redirected the output of the command somewhere else – including /dev/null – that’s where it goes instead. nohup command >/dev/null 2>&1 # doesn’t create nohup.out Note that the >/dev/null 2>&1 sequence can be abbreviated to just … Read more
The -i option streams the edited content into a new file and then renames it behind the scenes, anyway. Example: sed -i ‘s/STRING_TO_REPLACE/STRING_TO_REPLACE_IT/g’ filename while on macOS you need: sed -i ” ‘s/STRING_TO_REPLACE/STRING_TO_REPLACE_IT/g’ filename
Was looking for the same thing, and found this to suggest: tail -n +1 file1.txt file2.txt file3.txt Output: ==> file1.txt <== <contents of file1.txt> ==> file2.txt <== <contents of file2.txt> ==> file3.txt <== <contents of file3.txt> If there is only a single file then the header will not be printed. If using GNU utils, you … Read more
Use: grep — -X Documentation Related: What does a bare double dash mean? (thanks to nutty about natty).
Early versions of unix measured system time in 1/60 s intervals. This meant that a 32-bit unsigned integer could only represent a span of time less than 829 days. For this reason, the time represented by the number 0 (called the epoch) had to be set in the very recent past. As this was in … Read more
The very first alias I made once I started customizing my profile in PowerShell was ‘which’. New-Alias which get-command To add this to your profile, type this: “`nNew-Alias which get-command” | add-content $profile The `n at the start of the last line is to ensure it will start as a new line.
If using GNU grep, you can use the Perl-style regexp: grep -P ‘\t’ *
In simple words, when you open a file, the operating system creates an entry to represent that file and store the information about that opened file. So if there are 100 files opened in your OS then there will be 100 entries in OS (somewhere in kernel). These entries are represented by integers like (…100, … Read more
Man pages for diff suggest no solution for colorization from within itself. Please consider using colordiff. It’s a wrapper around diff that produces the same output as diff, except that it augments the output using colored syntax highlighting to increase readability: diff old new | colordiff or just: colordiff old new Installation: Ubuntu/Debian: sudo apt-get … Read more
Unix uses 0xA for a newline character. Windows uses a combination of two characters: 0xD 0xA. 0xD is the carriage return character. ^M happens to be the way vim displays 0xD (0x0D = 13, M is the 13th letter in the English alphabet). You can remove all the ^M characters by running the following: :%s/^M//g … Read more