{{tag>CLI Commands}}
======Linux CLI Commands======
Various Linux CLI (Command Line Interface) Commands with examples and grouped by type

=====File System=====

====Find specific file types====
  *Using ''ls'':
    *''ls -lhaF | grep ^l''   # list links
    *''ls -lhaF | grep ^d''   # list directories
    *''ls -lhaF | grep ^-''   # list files

  *using ''find'':
    *''find . -type l -ls''
    *''find . -maxdepth 1 -type l -ls'' to process the current directory only, i.e. not recurse.

References:
  *[[https://askubuntu.com/questions/522051/how-to-list-all-symbolic-links-in-a-directory|How to list all symbolic links in a directory]]
  *[[https://mywiki.wooledge.org/ParsingLs|Why you shouldn't parse the output of ls(1)]]
====check file system size====

===du===
Estimate file space usage
  *''du -hd1 /file_path''  lists and summaries directories sizes under /file_path 1 directory deep, where:
    *''-d'' set the reporting depth flag
    *''-h'' set human readable format
  *''du -s /tmp /var'' lists the summary of directories /var and /tmp only, where:
    * ''-s'' set summaries 
  * ''%%sudo du -hd1 --exclude={/mnt,/run,/proc} /%%'' to check root (/).
    * It is important to exclude the noted directories as they are temporary or external drives.  Note I mount my external drives within ''/mnt''.  This speed up performance and remove errors and associated messages, decluttering the output.
===ncdu===
ncdu is a 'smart' version of du.  It needs to be specifically installed, e.g. ''sudo apt install ncdu''.
  *''ncdu'' on the current directory
  *''%%ncdu --exclude-kernfs --exclude /mnt /%%''  to check root (/) directory excluding system and mounts 

===df===
df - report file system space usage
  * ''df -h'' prints file system and spage usage in human readable format

===duf===
duf - disk usage / Free utility, an updated version of df utility.  It needs to be specifically installed, e.g. ''sudo apt install duf''.
  * ''duf''

=====Devices=====

====lshw====
Command to list hardware configuration parameters.
  *''sudo lshw -short'' list hardware in short form.
  *''sudo lshw -c cpu'' lists the cpu hardware, the following device types can be listed
    *system
    *bridge
    *memory
    *processor
    *address
    *storage
    *disk
    *tape
    *bus
    *network
    *display
    *input
    *printer
    *multimedia
    *communication
    *power
    *volume
    *generic

====man====
  *''apropos''
  *''%%man 5 crontab%%'' or ''%%man 'crontab(5)'%%'' will specifically list the man for contab(5)
  *

====crontab====
''sudo crontab -e'' can be used to safely 
=====Networking Specific=====


<- tech_notes:programs|back ^ tech_notes:index|Start page ^ tech_notes:alpine|next->