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mkdir– make directories Usage: mkdir [OPTION] DIRECTORY… eg. mkdir lhn ls– list directory contents Usage: ls [OPTION]… [FILE]… eg. ls, ls *l, ls lhn cd– changes directories Usage: cd [DIRECTORY] eg. cd lhn pwd*- print name of current working directory Usage: pwd vim– Vi Improved, a programmers text editor Usage: vim [OPTION] [file]… eg. vim lhn.txt cp – copy files and directories Usage: cp [OPTION]… SOURCE DEST eg. cp sample.txt sample_copy.txt cp sample_copy.txt target_dir mv– move (rename) files Usage: mv [OPTION]… SOURCE DEST eg. mv source.txt target_dir mv old.txt new.txt rm* remove files or directories Usage: rm [OPTION]… FILE… eg. rm file1.txt , rm *rf some_dir find– search for files in a directory hierarchy Usage: find [OPTION] [path] [pattern] eg. find file1.txt, find *name file1.txt history– prints recently used commands Usage: history cat– concatenate files and print on the standard output Usage: cat [OPTION] [FILE]… eg. cat file1.txt file2.txt cat *n file1.txt echo– display a line of text Usage: echo [OPTION] [string] … eg. echo I love RST echo $HOME grep*- print lines matching a pattern Usage: grep [OPTION] PATTERN [FILE]… eg. grep *i apple sample.txt wc*- print the number of newlines, words, and bytes in files Usage: wc [OPTION]… [FILE]… eg. wc file1.txt wc *L file1.txt sort– sort lines of text files Usage: sort [OPTION]… [FILE]… eg. sort file1.txt sort *r file1.txt tar– to archive a file Usage: tar [OPTION] DEST SOURCE eg. tar *cvf /home/archive.tar /home/original tar *xvf /home/archive.tar kill– to kill a process(using signal mechanism) Usage: kill [OPTION] pid eg. kill *9 2275 ps– report a snapshot of the current processes Usage: ps [OPTION] eg. ps, ps *el who– show who is logged on Usage: who [OPTION] eg. who , who *b , who *q passwd– update a user’s authentication tokens(s) Usage: passwd [OPTION] eg. passwd su– change user ID or become super*user Usage: su [OPTION] [LOGIN] eg. su remo, su chown– change file owner and group Usage: chown [OPTION]… OWNER[:[GROUP]] FILE… eg. chown remo myfile.txt chmod– change file access permissions Usage: chmod [OPTION] [MODE] [FILE] eg. chmod 744 calculate.sh zip– package and compress (archive) files Usage: zip [OPTION] DEST SOURSE eg. zip original.zip original unzip– list, test and extract compressed files in a ZIP archive Usage: unzip filename eg. unzip original.zi ssh– SSH client (remote login program) “ssh is a program for logging into a remote machine and for executing commands on a remote machine” Usage: ssh [options] [user]@hostname eg. ssh *X guest@10.105.11.20 scp– secure copy (remote file copy program) “scp copies files between hosts on a network” Usage: scp [options] [[user]@host1:file1] [[user]@host2:file2] eg. scp file1.txt guest@10.105.11.20:~/Desktop/ fdisk– partition manipulator eg. sudo fdisk *l mount– mount a file system Usage: mount *t type device dir eg. mount /dev/sda5 /media/target unmount– unmount file systems Usage: umount [OPTIONS] dir | device… eg. umount /media/target du– estimate file space usage Usage: du [OPTION]… [FILE]… eg. du df– report filesystem disk space usage Usage: df [OPTION]… [FILE]… eg. df quota– display disk usage and limits Usage: quota [OPTION] eg. quota *v reboot– reboot the system Usage: reboot [OPTION] eg. reboot poweroff – power off the system Usage: poweroff [OPTION] eg. poweroff kate– KDE Advanced Text Editor Usage: kate [options][file(s)] eg. kate file1.txt file2.txt vim– Vi Improved, a programmers text editor Usage: vim [OPTION] [file]… eg. vi hello.c gedit* A text Editor. Used to create and edit files. Usage: gedit [OPTION] [FILE]… eg. gedit bg– make a foreground process to run in background Usage: type ‘ctrl+z’ and then ‘bg ‘ fg– to make background process as foreground process Usage: fg [jobid] jobs– displays the names and ids of background jobs Usage: jobs sed* stream editor for filtering and transforming text Usage: sed [OPTION] [input*file]… eg. sed ‘s/love/hate/g’ loveletter.txt awk* pattern scanning and processing language eg. awk *F: ‘{ print $1 }’ sample_awk.txt find* search for files in a directory hierarchy Usage: find [OPTION] [path] [pattern] eg. find *name file1.txt locate– find or locate a file Usage: locate [OPTION]… FILE… eg. locate file1.txt Linux File Permissions 3 types of file permissions – read, write, execute 10 bit format from ‘ls *l’ command 1 2 3 4 5 6 7 8 9 10 file type owner group others eg. drwxrw*r** means owner has all three permissions, group has read and write, others have only read permission read permission – 4, write – 2, execute *1 eg. rwxrw*r** = 764 673 = rw*rwx*wx

Cuckoo Sandbox is a malware analysis system. It simply means that you can throw any suspicious file at it and in a matter of seconds Cuckoo will provide you back some detailed results outlining what such file did when executed inside an isolated environment. Download: Automated Malware Analysis - Cuckoo Sandbox

AxCrypt is the leading open source Windows file encryption software. It integrates seamlessly with Windows to compress, encrypt, decrypt, store, send and work with individual files. Personal Privacy and Security with AES-128 File Encryption and Compression for Windows 2000/2003/XP/Vista/2008/7. Double-click to automatically decrypt and open documents. Store strong keys on removable USB-devices.Axantum Software AB | AxCrypt | File Encryption Software Features Password Protect any number of files using strong encryption. Right-click integration with Windows Explorer makes AxCrypt the easiest way to encrypt individual files in Windows. Double-click integration makes it as easy to open, edit and save protected files as it is to work with unprotected files. Many additional features, but no configuration required. Just install it and use it. AxCrypt encrypts files that are safely and easily sent to other users via e-mail or any other means. Self-decrypting files are also supported, removing the need to install AxCrypt to decrypt. AxCrypt is translated into English, Danish, Dutch, French, German, Hungarian, Italian, Norwegian, Russian, Polish, Spanish and Swedish so chances are it speaks your preferred language. AxCrypt is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation. You can download AxCrypt here: AxCrypt-1.7.2976.0-Setup.exe Axantum Software AB | AxCrypt | File Encryption Software

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