Commands

From LinuxIntro
(Redirected from Command)
Jump to: navigation, search

Here are important commands that you should be aware of:

  • cat : input from stdin or a file and output to stdout or a file
  • cd : change directory
  • date : show and set the system date and time
  • df : find out how much space is free on your disks
    • df -h : find out how much space is free on your disks in a sensible format
  • disown - removes a process from its parent process, allowing it to continue after the parent exits
  • dig - query a name server for a server's IP address
  • du -sch * : find out how much space is used on your disks
  • echo : output a string to console (rather, to stdout)
    • echo mem > /sys/power/state : put the computer into standby-mode
  • ethtool : is a network cable connected and which link does it have?
  • fdisk : partition a hard disk
  • file : find out the type of a file
  • hwinfo : find out what harddisk, processor, graphics card and so on you have
    • hwinfo --block --short : find out what disks and partitions you have
    • hwinfo --cpu --short: find out what processors you have
  • ldd : list dependencies of an executable file
  • ls : list files
    • ls -ltr : list files, latest last
  • lsof : list open files in the system
  • mkdir : makes a directory
  • netstat : show network connections
    • netstat -putan : show network connections in a sensible way
  • ps : show running processes
    • ps -A : show all running processes
    • ps -ef : show all processes and their uptime
  • route : manage the network routing table
  • scp : copy over the network
  • shred : wipe data off your computer
  • sleep : waits for a given time
  • ssh : call a program over the network on another computer
  • strace : list all syscalls performed by a program
    • strace -e open : list all files that a program reads/writes to/from
  • tar : pack and unpack file archives
    • tar -xvzf : unpack .tar.gz files
    • tar -xvjf : unpack .tar.bz2 files
    • tar -cvzf : pack to .tar.gz files
  • top : show the top CPU/RAM consuming processes
  • vmstat - how much I/O is your computer doing?
  • which - where does a program lodge?
  • xosview - gives you a nice overview about system load: CPU, disks, swap etc.
  • zip - pack files so WinZip can extract them

See also