linux cheat sheet

# resources
ps -eo size,rss,pid,user,comm --sort -rss | head -n 30
ps -eo size,rss,pcpu,pid,user,comm --sort -pcpu | head -n 30

# memstat
atop -L160 1 1 | grep MEM

# caches

# chmod directories

# awk epoch to timestamp in logs
awk '{a = strftime("%F %T", $1); $1 = "" ; print a" "$0}'

# safe file delete

# some magic in resolv.conf

# default browser ( set default apps )
xdg-mime default firefox.desktop x-scheme-handler/http
xdg-mime default firefox.desktop x-scheme-handler/https

# keyboard
setxkbmap -layout us,ru -option grp:toggle

# qt crutch
export QT_GRAPHICSSYSTEM=native | raster | opengl

# swap usage by pid

# sqlite

# get url
wget -qO- http://foo/response
wget -qO- http://bar/api/json/response | python -m json.tool
wget -qO- http://bar/api/json/response | jq
wget -qO- http://bar/api/json/response | jq '.[] | select((.k_1 == 1) or (.k_2 == 2)) | "k1:\(.k_1) k2:\(.k_2)"'

# ssh/sshfs
sshfs -o reconnect -o auto_unmount 192.168.5.5:/mnt/data/usorted/ ~/sshfs/unsorted/