Zsh

if you want an arbitrary argument, you can use !!:1, !!:2, etc. (!!:0 is the previous command itself.

http://zsh.sourceforge.net/Doc/Release/zsh_toc.html#SEC_Contents

n=${f##*dv} - strip everything until dv (prefix) and assign to n
${n%%.*} - strip everything until . (suffix) and assign to n

~ a=abcd123.png ; echo ${a##*bc}; d123.png ~ a=abcd123.png ; echo ${a%%png}; abcd123.
C-x C-e calls $EDITOR

Plugins

all documentation

cd /u/lo/li<TAB>        # autcompletes /usr/local/lib

autojump

j foo                   # jump to a directory that contains foo
jo foo                  # open a file explorer 
autojump -s             # stats

common-aliases

# long listing by creation time
lt          # ls -ltFh

l           # ls -lFh (long, classify files, human readable)
la          # ls -lAFH (allmost-all [not `.` and `..`], follow-symlinks)
lr          # ls -tRFh (by mod. time, recursive)
ll          # ls -l
ldot        # ls -ld .*
lS          # ls -1FSsh (one line pre line, sort by filesize, size)
lart        # ls -1Fcart (sort by ctime) 
lrt         # ls -1Fart 
h           # history
p           # processes for current user

end of command aliases:

L           # | less
LL          #  2>&1 | less
G           # | grep
NE          #  2> /dev/null
NUL         #  > /dev/null 2>&1

H           # | head
T           # | tail
M           # | most
CA          #  2>&1 | cat -A
P           #  2>&1 | pygmentize -l pytb

copyfile

copies content of a file into clipboard

jsontools

pp_json         # pretty print json
is_json         # returns true if valid json; false otherwise

pass

autocompletion doesn't work:

rm ~/.zcompdump* 
exec zsh                    # restart zsh

websearch

google query
duckduckgo query