https://blog.ohidur.com/tags/bash/Recent content in bash on Ohidur's BlogHugo -- gohugo.ioenme@ohidur.com (Ohidur Rahman Bappy)me@ohidur.com (Ohidur Rahman Bappy)©{year} Ohidur.comSat, 12 Dec 2020 00:00:00 +0000https://blog.ohidur.com/posts/cheatsheet/bash/Sat, 12 Dec 2020 00:00:00 +0000me@ohidur.com (Ohidur Rahman Bappy)Mon, 08 Mar 2021 14:06:10 +0600https://blog.ohidur.com/posts/cheatsheet/bash/! /bin/bash ECHO COMMAND echo Hello World! VARIABLES Uppercase by convention Letters, numbers, underscores NAME="Bob" echo "My name is $NAME" echo "My name is ${NAME}" USER INPUT read -p "Enter your name: " NAME echo "Hello $NAME, nice to meet you!" SIMPLE IF STATEMENT if [ "$NAME" == "Bappy" ] then echo "Your name is Bappy" fi IF-ELSE if [ "$NAME" == "Bappy" ] then echo "Your name is Bappy" else echo "Your name is NOT Bappy" fi ELSE-IF (elif) if [ "$NAME" == "Bappy" ] then echo "Your name is Bappy" elif [ "$NAME" == "Jack" ] then echo "Your name is Jack" else echo "Your name is NOT Bappy or Jack" fi COMPARISON NUM1=31 NUM2=5 if [ "$NUM1" -gt "$NUM2" ] then echo "$NUM1is greater than $NUM2" else echo "$NUM1is less than $NUM2" fi ####### val1 -eq val2 Returns true if the values are equal val1 -ne val2 Returns true if the values are not equal val1 -gt val2 Returns true if val1 is greater than val2 val1 -ge val2 Returns true if val1 is greater than or equal to val2 val1 -lt val2 Returns true if val1 is less than val2 val1 -le val2 Returns true if val1 is less than or equal to val2 ####### FILE CONDITIONS FILE="test.Ohidur Rahman Bappybashprogramminghttps://blog.ohidur.com/posts/cheatsheet/ssh/Sat, 12 Dec 2020 00:00:00 +0000me@ohidur.com (Ohidur Rahman Bappy)Mon, 08 Mar 2021 14:06:10 +0600https://blog.ohidur.com/posts/cheatsheet/ssh/SSH Cheat Sheet Login via SSH with password (LOCAL SERVER) $ ssh brad@192.168.1.29 Create folder, file, install Apache (Just messing around) $ mkdir test $ cd test $ touch hello.txt $ sudo apt-get install apache2 Generate Keys (Local Machine) $ ssh-keygen Add Key to server in one command > cat ~/.ssh/id_rsa.pub | ssh brad@192.168.1.29 "mkdir -p ~/.ssh && chmod 700 ~/.ssh && cat >> ~/.ssh/authorized_keys Create & copy a file to the server using SCP $ touch test.Ohidur Rahman Bappybash