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tech_notes:linux_commands [2025-05-24 Sat wk21 15:53] – baumkptech_notes:linux_commands [2026-03-22 Sun wk12 09:59] (current) – [ncdu] baumkp
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 +{{tag>CLI Commands}}
 ======Linux 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->