CommandLineFu Random Tips

# vim: ft=markdown

# Read randomly generated CLI tips wget -qO - http://www.commandlinefu.com/commands/random/plaintext | sed -n '1d; /./p'

# get all bookmarks from all profiles from firefox
`"SELECT strftime('%d.%m.%Y %H:%M:%S', dateAdded/1000000, 'unixepoch', 'localtime'),url FROM moz_places, moz_bookmarks WHERE moz_places.id = moz_bookmarks.fk ORDER BY dateAdded;";  done`
# Encrypt your file using RC4 encryption
`hashkey=`echo -ne <your-secret> | xxd -p`; openssl rc4 -e -nosalt -nopad -K $hashkey -in myfile.txt -out myfile.enc.txt`
# Block an IP address from connecting to a server
`iptables -A INPUT -s 222.35.138.25/32 -j DROP`
# View details of network activity, malicious or otherwise within a port range.
`lsof -i :555-7000`
# Rename files in batch
`rename 's/^hospital\.php\?loc=(\d{4})$/hospital_$1/' hospital.php*`
# oneliner to transfer a directory using ssh and tar
`tar cvzf - dir | ssh my_server 'tar xzf -'`
# Mac OS X (laptops ??) only :  control hibernation state more easily from Terminal.app
`sudo pmset -a hibernatemode 1`
# Inverted cowsay
`echo Which way up? | flip.pl | cowsay | tac | sed -e "s,/,+,g" -e "s,\\\,/,g" -e "s,+,\\\,g" -e "s,_,-,g" -e "s,\^,v,g"`
# Compare directories (using cmp to compare files byte by byte) to find files of the same name that differ
```bash
find . -maxdepth 1 -mindepth 1 -print0 | xargs -0 -n 1 -I % cmp % /DUPDIR/% 2>/dev/null
```
# Downloads files (through wget) from a list of URLs using a stored cookie
`wget --load-cookies <cookie-file> -c -i <list-of-urls>`
# Adding Prefix to File name
`rename 's/^/CS749__/' *.pdf`
# Merge only certain pdfs in a directory
`gs -dNOPAUSE -sDEVICE=pdfwrite -sOUTPUTFILE=merged.pdf -dBATCH `ls | grep foo``
# Use md5 to generate a pretty hard to crack password
`echo "A great password" | md5sum`
# list files recursively by size
`stat -c'%s %n' **/* | sort -n`
# Show amicable path
`alias path='echo $PATH | tr ":" "\n"'`
# Tool for generating system resource statistic
`dstat`
# Create a tar of directory structure only
`tar -cf ~/out.tar --no-recursion --files-from <(find . -type d)`
# Debug pytest failures in the terminal
`pytest --pdbcls pudb.debugger:Debugger --pdb --capture=no`
# Extract raw URLs from a file
`egrep -ie "<*HREF=(.*?)>" index.html | awk -F\" '{print $2}' | grep ://`
# Display the top ten running processes - sorted by memory usage
top -b -o +%MEM |head -17
# Snmpwalk a hosts's entire OID tree with SNMP V3 with SHA Authentication and with Privacy
snmpwalk -v3 -On -u <user> -l AuthPriv -a SHA -A <auth_password> -X <encryption_password> -m ALL <HOST_IP> .
# Human readable docker stats output
docker stats --no-stream $( docker ps -q ) | sed -e "$( docker ps --format "{{.ID}} {{.Names}}" | sed -e "s/\(.*\) \(.*\)/s\/\1\/\2\t\/g;/" )"
# Realtime delay effect
arecord -D plughw:1,0 | play -d echos 0.3 0.2 700 0.25 800 0.3
# Rename files in batch
rename 's/^hospital\.php\?loc=(\d{4})$/hospital_$1/' hospital.php*
# list size and directies in curretn folder
du -sh ./*/
# PulseAudio: set the volume via command line
pactl set-sink-mute 0 false ; pactl set-sink-volume 0 +5%
# Android PNG screenshot
adb exec-out screencap -p > screenshot.png
# Find a CommandlineFu users average command rating
curl -s www.commandlinefu.com/commands/by/PhillipNordwall | awk -F\> '/num-votes/{S+=$2; I++}END{print S/I}'
# transpose a file
awk '{ for (f = 1; f <= NF; f++)   a[NR, f] = $f  }  NF > nf { nf = NF } END {   for (f = 1; f <= nf; f++) for (r = 1; r <= NR; r++)     printf a[r, f] (r==NR ? RS : FS)  }'
# list all directory sizes and sort by size
du -ks * | sort -nr | cut -f2 | xargs -d '\n' du -sh