13 Linux Commands Every Engineer Should Know

uname operative system

uname
#Linux

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pwd current directory

pwd
#/home/userName

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cd change directory

cd /etc
#username@server: /etc$

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ls list directory

flags:

    -l  list directory with all information
    #drwxr-xr-x  2 root root     4096 Apr 26 00:00 backups
    #drwxr-xr-x 23 root root     4096 Apr 22 07:55 cache

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cat visualize content file

cat file.name
#Lorem ipsum dolor sit amet, esse cupidatat ipsum ea. 
#Adipisicing officia dolore aliquip incididunt ea adipisicing officia laboris incididunt veniam consectetur.

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| "Pipe" command is used to pass the output of one command as input to another

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grep filter, stands for Global Regular Expression Print

cat file.name | grep textInSide
cat file.name | grep textInSide > resultSaveInFileName

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wc word count command

flags:
    -l  count lines
    -w  count words
    -c  count bytes
    -m  count characters
    -L  find longest line length

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cp copy file to

cp file.name file.name.copy

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find used to search for files and directories in directory hierarchy

    .   current directory
    /   root file system

        ex: find / -name "*.conf"
        ex: find / -name "*.conf" | grep db     that have db in it

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diff difference between two files

    ex: diff file.name file.name.bk

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curl stands for Client URL

    "used to transfer data from or to a server
    using various protocols like HTTP, FTP 
    commonly used for interacting with APISs 
    and debugging networking requests"

	ex: curl https://google.com

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chmod change permissions on file access

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root change to root

sudo su -
sudo -i
#root@serverName:~#