The System's default text editor can be defined within /etc/profile. It's given the variable EDITOR.

Add these lines to /etc/profile.d/local.sh:

1
2export EDITOR=vim
3
4export VISUAL=$EDITOR

Then reload that profile with:

1source /etc/profile

If you want to ensure nano never appears again:

1sudo ln -sf $(which vim) $( …

mtpfs

Start

Install:

1yay -S simple-mtpfs

List available phones:

1simple-mtpfs -l

Make a mount point:

1mkdir phone

Check your phone, and tell it to allow access to the USB.

1simple-mtpfs --device 1 phone

Stop

1fusermount -u phone
2rmdir phone

Basics

See a file's contents:

Return full contents of a string:

1awk '{ print }' file

Print the first and second column:

1awk '{print$1$2}'

Return every line with the word 'the' (like grep):

1awk '/the/{print}' file

Print everything containing a lowercase letter:

1awk '/[a-z]/{print}' …

Convert a text file from one encoding type to another with:

1iconv -f ascii -t utf8 oldfilename > newfilename

Available options are:

• ISO-8859-15

• UTF-8

• ASCII

• Lots more

Generate a full list of encoding types available with:

1iconv -l

rdfind: find duplicate files, then delete them, or turn them into links.

Ask if a directory has duplicates (rdfind will not delete anything):

1rdfind $dir
2$EDITOR results.txt

Replace the duplicated files with hard links.

1rdfind -makehardlinks true $dir

Basics

The ordering of /etc/fstab is

1. disk
2. mount point
3. filesystem type
4. options
5. dump
6. pass

Example:

1UUID=877f14e8-4738-46b0-884f-ba330dad1a7d       /mnt/biggie                     ext4        nofail,rw,relatime      0 2
2
3UUID=B21648C416488AF5 /mnt/share ntfs …

Check which kernet modules are loaded into memory

1sudo /sbin/lsmod 

Check which virtual box modules are loaded into memory

1sudo /sbin/lsmod | grep vbox 

Virtual box is using vboxpci, vboxnetadp, vboxnetflt, vboxdr.

Look at what's claiming wifi:

1sudo lshw -C network

If this shows that the device is 'unclaimed' then …

Basic

Keeping track of health problems. Mostly under /var/log/.

These logs are created by syslogd (or syslog in earlier distros).

Rundown

`alternatives.log' has a bunch about other programs installing things around 5 times a day. This includes x-www-browser, which sets the default browser (supposedly - this doesn't …

Print the average CPU load over 1 minute, 5 minutes, and 15 minutes:

1watch -d cat /proc/loadavg
2stress="$(cat /proc/loadavg | awk '{print "Usage:" $2"%"}')"

Show memory usage in Gibitytes.

1free -g

Show low and high gigibtye usage on a line, and repeat the measurement every 5 seconds: …

FDisk Basics

1sudo fdisk /dev/sda

• m for help.

• n to make a partition.

• t to mark the partition type (see IDs below).

• w to write the changes to the disk.

Note the asterisk marking the boot partition.

IDs