Linux Commands

• To search file in terminal
  find /. -name filename\*
  
• List the files in your current directory
  ls
  
• Short cut to open terminal
  ctrl+alt+t(ubuntu)
  
• command will allow you to know in which directory you're located
  pwd(pwd stands for "present working directory")
  
• command to copy the file
  "cp file foo" will make an exact copy of "file" and name it "foo"
  "cp -r directory foo" (copy recursively). (To understand what "recursively" means, think of it this way: to copy the directory and all its files and subdirectories and all their files and subdirectories of the subdirectories and all their files, and on and on, "recursively")
• command to move file from location to other location
  "mv file foo" will rename the file "file" to "foo"
  
• command to remove file from directory
  "rm file"
  
• command is used to show you the manual of other commands
  "man command"
  
• command to run a file using the command-line
  ./filename.extension
  
• command to edit text file
  vi filename
  
• commands that you want to run on a regular schedule(run cmds to fixed time)
  crontab -e
  For more information
  
• To get processid of process
  ps aux | grep processname
• To kill process
  kill - 9 processid
• To get ipaddress using url
  nslookup url(hostname)
• To get size of disk
  du dirname
• To create tar(zip) file
  tar -zcvf zipfilename.tar.gz filename(should be zip)
• To create untar(un zip) file
  tar -xzvf filename.tar.gz
• How to enable root user
  sudo passwd root
• cmd to zip
  zip -r zipfilename filehastodozip
• To get size of disk
  df -h
• cmd to copy the file
  cp existingfile /newfile cp -p filename /path/to/new/location/myfile(To copy a file to a new file and preserve the modification date, time, and access control list associated with the source file, enter:)
• cmd to know the process name using port number
  netstat -tulpn | grep :portnumber
• cmd to get jar version in terminal
  java -jar jarname
• cmd to check who are logged into the
  finger
• Used to include manifest information from an existing manifest file
  jar cmf existing-manifest(path of manifest file) jar-file input-file(s)
• Command to check if ACL is opened from one host to another host
  nc -z hostname portnumber
• Command to check db information which is existing in filesystem
  tnsping filesystem
• Command to replace a string in multiple files
  perl -pi -e 's/oldstring/newstring/g' *
• Command to get only jar names which are present in directory
  ls -lrt| awk '{print $10}'|awk -F '.jar' '{print $1}'
• command to get total size of all files
  ls -FaGl "${@}" | awk '{ total += $5; print }; END { print total }';
• Compare two directories in linux
  diff -r directory1 directory2
• To get os information
  uname -a