Why create system call is called creat? [closed]
From LSP (page 28): Yes, this function’s name is missing an e. Ken Thompson, the creator of Unix, once joked that the missing letter was his largest regret in the design of Unix.
linux
Trace of executed programs called by a Bash script
A simple script I wrote some days ago… # FILE : sctrace.sh # LICENSE : GPL v2.0 (only) # PURPOSE : print the recursive callers’ list for a script # (sort of a process backtrace) # USAGE : [in a script] source sctrace.sh # # TESTED ON : # – Linux, x86 32-bit, Bash 3.2.39(1)-release … Read more
What is the format of the x86_64 va_list structure?
The x86-64 System V ABi doc may help. It’s a reference, albeit lightweight. The Variable Argument List reference starts on page 54, then it goes on, page 56-57 documents va_list: The va_list Type The va_list type is an array containing a single element of one structure containing the necessary information to implement the va_arg macro. … Read more
Cannot use mkdir in home directory: permission denied (Linux Lubuntu) [closed]
As @kirbyfan64sos notes in a comment, /home is NOT your home directory (a.k.a. home folder): The fact that /home is an absolute, literal path that has no user-specific component provides a clue. While /home happens to be the parent directory of all user-specific home directories on Linux-based systems, you shouldn’t even rely on that, given … Read more
how to install gcc-12 on ubuntu
gcc-12 is not available in ubuntu 20.04, so we need to compile it from source code, here are the steps which I borrowed from this video: Step 1: clone gcc source code and checkout gcc-12 branch $ git clone https://gcc.gnu.org/git/gcc.git gcc-source $ cd gcc-source/ $ git branch -a $ git checkout remotes/origin/releases/gcc-12 Step 2: make … Read more
Adding users to sudoers through shell script
You could simply echo (with elevated privileges, of course) directly to the /etc/sudoers file: sudo -i echo ‘nickw444 ALL=(ALL:ALL) ALL’ >> /etc/sudoers # ^^ # tab (note the tab character between the username and the first ALL) Or, for a script: #!/bin/bash # Run me with superuser privileges echo ‘nickw444 ALL=(ALL:ALL) ALL’ >> /etc/sudoers Then … Read more
Draw a horizontal line from dash character occupying the full width of a terminal in bash
Try with: echo some text printf ‘%*s\n’ “${COLUMNS:-$(tput cols)}” ” | tr ‘ ‘ – echo some text
I get “fatal: unable to create threaded lstat” error when I run “git status” command
If the resource limit can’t be removed by the hosting provider, you could consider using git config to disable preloading of the index (threaded lstat). git config core.preloadIndex false If you need that setting when cloning the initial repository, then you will need to set it globally. git config –global core.preloadIndex false
How to display only different rows using diff (bash)
a.txt: 1;john;125;3 1;tom;56;2 2;jack;10;5 b.txt: 1;john;125;3 1;tom;58;2 2;jack;10;5 Use comm: comm -13 a.txt b.txt 1;tom;58;2 The command line options to comm are pretty straight-forward: -1 suppress column 1 (lines unique to FILE1) -2 suppress column 2 (lines unique to FILE2) -3 suppress column 3 (lines that appear in both files)