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******************** pwd, ls, cd, mkdir ********************
present wprking directory see command ------- pwd
For see any kinds of file list ----- ls
changing directory command is ------- cd directory name
making new directory command is ----- mkdir making fileName
if you want to create a file directory on directory then file then command --- mkdir -p directoryName/folderName/fileName
**** if i want see my ssh key ====>> cat ~/.ssh/id_rsa.pub
********************** Ctrl, Alt, exit, clear ******************
for terminal clear command is ------- clear
if you wnat to exit the terminal then simply command ----- exit
for command line scrolling to first command ----- Ctrl+l
for go to command line first word then command --- Ctrl+a
then for go to command line end command ------ Ctrl+e
if you want to back one word then command ---- Alt + b [b means backward]
if you want to forward one then command ------ Alt + f [ f means forward]
if you want to back one alphabet then command ----- Ctrl + b [backward]
if you want to forward one alphabet then command --- Ctrl + f [forward]
if you want to delete backward one word then command ---- Alt + backspacing
if you want to delete backword one word then command ----- Alt + d
************************** touch, cat, less, gedit, vim, whoami, date, time *************************
for open a file on directory then go to the cd command to this directory then command ---- touch fileName
for read any file then command ----- cat fileName or less fileName
if you want to see head side line of file command ------ head fileName
if you want to see tail side line of the file command --- tail fileName
open a file with gedit editor or vim editor ----- gedit fileName and vim fileName
see your pc name then command ---- whoami
see todays date command ---- date
see time then command ------ time
if you want to open calender then command --- cal
if you want to see full year calender command --- cal year
************************** cat,cd .. ,code . ,rm,mv,cp **************************
if you see more command which you dont know then command ------- cat --h
once you go to a directory to another directory but want to go agin first directory then command ---- cd ..
if you want to go again past directory then command ---- cd ../..
if you want to open your vscode editor to write some code then simply command on your bash ------ code .
for open your google chrome from your bash command then command --- google-chrome
if you remove any file then command ---- rm fileName
if you remove any directory then command ----- rm -rf directoryName
if you want to rename any file or directory then simply command ----- mv oldFileName newFileName
if you move any file file one repo to another repo then command ----- mv fileName Repository name
if copy somethinng one file to another file then command ----- cp fromFileName toFileName
if you need something bigger then command ----- man , then command ---- man which you want
if i want to take some code to githb file raw then create a file then goto the file command ----- curl -O rawLink, [that called download code with curl command].
**** For shell scripting .sh extended file make executabel use = chmod 777 FileName
Description = in general chmod means change modules and its stands 4 = read, 2 = write, 1 = execute and all total 7 that why we give access 777 for all permission for execution
### when we write any shell script file we have to add first Shebang or hashbang like = #!/bin/bash
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### Monitoring and troubleshooting command###
### networking troubleshooting linux command###
*** hostname => To check and set the hostname of the server.
*** host => To get host DNS details
*** ping => Checks if the remote server is reachable using ICMP protocol. It also shows the round trip time of packets.
*** curl => A cross-platform utility that is used to transfer data. It can be used for troubleshooting several network issues.
*** wget => Utility to download files. Can be used for troubleshooting proxy connections and connectivity.
*** ip => A replacement for ifconfig. Can be used to configure and retrieve information about systems network interfaces
*** arp => Utility to view and manage arp cache.
*** ss/netstat => Primarily used to check the connections and PID on ports and Unix sockets.
*** traceroute => This utility uses the ICMP protocol and finds the hops involved in reading the destination server. It also shows the time it takes between hops.
*** mtr => mtr is a mix of ping and traceroute. It also provides additional information like intermediate hosts and responsiveness.
*** dig => Helps you get the DNS records associated with a domain name.
*** nslookup => Command similar to dig.
*** nc => utility to debug TCP/UDP sockets.
*** telnet => It can be used to test remote connectivity on ports
*** route => Helps you get all the route table information
*** tcpdump => This utility helps you to capture network packets and analyze them for network issues.
*** lsof => list all the open files and the process information that opened it
### Monitoring SRE troubleshooting ###
*** top => This command provides real-time information about system resource usage, including CPU, memory, and running processes. You might get overwhelmed as to what to look for in this output.you get "load average", "zombie process","cpu%","s", "SHR-shared memory","RS-resident memory use"
*** free => The free command is used to display the amount of free and used memory in the system, including both physical and swap memory. you know anout memory details like = "shared memory", "used", "total, "cached" and "available"
*** nproc => this for cpu and ram yoou can use
***