Above highlighted are the differences between‘grep’,‘egrep’and‘fgrep’. Apart from difference in the set of regular expressions used, and speed of execution, rest command line parameters remain same for all the three versions of grep and even instead of “egrep” or “fgrep”, “grep -E...
In case of bash shell, we can use shopt command and grep hupon to find out whether our shell sends SIGHUP signal to its child processes or not. If it is off, processes will not be terminated. In case its on, it works similar to ampersand command. ### Check if hup is on or off...
When it comes to text processing in Linux, the three tools that come in pretty handy are grep, sed, and awk. Although being totally different tools, their functionality seems to overlap in simple scenarios. For example, to find a pattern in a file and print the matches to the standard ou...
The difference between Linux and Windows begins with their history and evolution. At one time, Windows was the dominant desktop operating system, in an era where the desktop was the context to most computing. The advent of Local area networks (LANs), the Internet, and the World Wide Web inf...
Linux Kernel sys_call_table、Kernel Symbols Export Table Generation Principle、Difference Between System Calls Entrance In 32bit、64bit Linux【转】
Find Current Shell Process ID In bash when we call any external program from the shell, it will create a child process/subshell and the program will be submitted in the child process only. See below example where I put a simple process monitor command in a script called“sample.sh”to dem...
Portability alone does not offer the entire promise of Linux containers. You also need Compatibility and Supportability. Here’s why: Portability The standardized format of containers is what makes them portable betweenregistry serversandcontainer hosts. Since the recent wave of containers are g...
3. Linux 32bit、64bit下系统调用入口的异同 以sys_execve、sys_socketcall、sys_init_module这三个系统调用作为研究对象,为了更好的说明问题,我们打印一下Linux 64bit的sys_call_table的函数指针地址 find_sys_call_table.c #include <linux/module.h>#include <linux/init.h>#include <linux/types.h>#inclu...
We can find out which shell are we currently using by simply reading the/etc/passwdfile usinggrep: $ grep $USER /etc/passwd hey:x:1000:998::/home/hey:/bin/bash Thegrepcommand expects a pattern and a file to read from The$USERenvironment variable expands to the currently logged-in user...
For finding difference between two versions of a file on Linux, you can use any one of the 4 tools explained in this article — diff, colordiff, wdiff, and vimdiff. The screenshots provided for these tools shows the difference between the following two empfile1.txt and empfile2.txt. ...