Linux useradd userdel usermod passwd gpasswd

#create new user names tester 
sudo useradd tester

# add user to group 
sudo usermod -a -G group1,group2 username

# remove user from group sudo gpasswd -d username groupname

#delete user tester
sudo userdel  tester 

sudo userdel  -r tester  # delete files tester created. 

#completed delete user .forbidden
[root@localhost ~]# id tester 
  1000
[root@localhost ~]# find / -uid 1000
/home/tester
/home/tester/.log
/home/tester/.git
[root@localhost ~]# find / -user tester -exec rm -rf {} \;

#set password to user tester 
sodo passwd tester 

#show groups
 cat /etc/group

# create a group sudo groupadd groupname

#delete a group sudo groupdel groupname

#change a user's primary group sudo usermod -g groupname username sudo usermod -g developers tester

# append group to user
sudo usermod -aG groupname username # remove group from user 
 gpasswd -d username groupname 

#show users in group
sudo groups groupname

linux zip unzip

$ zip sample file1 file2 
  adding: file1 (stored 0%)
  adding: file2 (stored 0%)
$ ls
sample.zip  file1  file2

unzip sample.zip -d /var/www/html

nzip

UnZip 6.00 of 20 April 2009, by Debian. Original by Info-ZIP.

Usage: unzip [-Z] [-opts[modifiers]] file[.zip] [list] [-x xlist] [-d exdir]

  Default action is to extract files in list, except those in xlist, to exdir;

  file[.zip] may be a wildcard.  -Z => ZipInfo mode ("unzip -Z" for usage).

  -p  extract files to pipe, no messages     -l  list files (short format)

  -f  freshen existing files, create none    -t  test compressed archive data

  -u  update files, create if necessary      -z  display archive comment only

  -v  list verbosely/show version info       -T  timestamp archive to latest

  -x  exclude files that follow (in xlist)   -d  extract files into exdir

modifiers:

  -n  never overwrite existing files         -q  quiet mode (-qq => quieter)

  -o  overwrite files WITHOUT prompting      -a  auto-convert any text files

  -j  junk paths (do not make directories)   -aa treat ALL files as text

  -U  use escapes for all non-ASCII Unicode  -UU ignore any Unicode fields

  -C  match filenames case-insensitively     -L  make (some) names lowercase

  -X  restore UID/GID info                   -V  retain VMS version numbers

  -K  keep setuid/setgid/tacky permissions   -M  pipe through "more" pager

  -O CHARSET  specify a character encoding for DOS, Windows and OS/2 archives

  -I CHARSET  specify a character encoding for UNIX and other archives

See "unzip -hh" or unzip.txt for more help.  Examples:

  unzip data1 -x joe   => extract all files except joe from zipfile data1.zip

  unzip -p foo | more  => send contents of foo.zip via pipe into program more

  unzip -fo foo ReadMe => quietly replace existing ReadMe if archive file newer