Bash tricks

tricks.sh

# Who started a process?
pgrep PTPCamera
ps -O ppid -p 29045
ps -p 202
ps -A -O user | grep /sbin/launchd
launchctl list | grep PTPCamera
*.debug /var/log/debug.log
# ([0x0-0x2d92d9].com.apple.PTPCamera[24472]): Spawned by PID 240: com.apple.SystemUIServer.agent
sudo killall -HUP syslogd

launchctl list com.apple.SystemUIServer.agent {
    "Program" = "/System/Library/CoreServices/SystemUIServer.app/Contents/MacOS/SystemUIServer";
};

# find 
find . -type f -exec file -- {} +
find . -type f -exec wc -lcw -- {} +
find . -type f -exec file -- {} + 2>&1 | > tee file.txt

echo test | awk '{print toupper($1)}'
echo test | tr '[:lower:]' '[:upper:]'

seq -f %02g 1 10

yes | rm *.txt

# jobs

kill %1
jobs
fg


# CR/LF

cat infile | sed 's/\r\n$/\n/' | od -c

tr -d '\r' < infile > outfile
sed -i s/\r// file

sed -i -e '/^M/d' input
sed -e '/^M/d' -i -r $(find . -type f)

# find \r files
grep -r $'\r' *


# uniq (cut ununiq lines)
awk -F, '!array[$1]++' file.txt


# passgen
# LC_CTYPE=C tr -dc A-Za-z0-9_\!\@\#\$\%\^\&\*\(\)-+= < /dev/urandom | head -c 32 | xargs


genpasswd() {
	local l=$1
       	[ "$l" == "" ] && l=16
      	tr -dc A-Za-z0-9_ < /dev/urandom | head -c ${l} | xargs
}
 

date +%s | sha256sum | base64 | head -c 32 ; echo

< /dev/urandom tr -dc _A-Z-a-z-0-9 | head -c${1:-32};echo;

openssl rand -base64 32

tr -cd '[:alnum:]' < /dev/urandom | fold -w30 | head -n1

strings /dev/urandom | grep -o '[[:alnum:]]' | head -n 30 | tr -d '\n'; echo

< /dev/urandom tr -dc _A-Z-a-z-0-9 | head -c6

dd if=/dev/urandom bs=1 count=32 2>/dev/null | base64 -w 0 | rev | cut -b 2- | rev

</dev/urandom tr -dc '12345!@#$%qwertQWERTasdfgASDFGzxcvbZXCVB' | head -c8; echo ""

randpw(){ < /dev/urandom tr -dc _A-Z-a-z-0-9 | head -c${1:-16};echo;

date | md5sum}

bc <<< 2+3