Well, hard to think of a title, this will probably only ever get read by me, but its super random search patters with grep/awk and who knows what else
grep -Eo '[0-9]+' file | sort -rn | head -n 1 = highest number
grep -o '^[^ ]*' = Grep up till first space
grep -o '[0-9]*' = grep #'s one per line
grep -o '"[^"]\+"' >> text.file = Output Grep in double Quotes "RESULTS"
cut -d' ' -f17,20 = Cut out everything except #'s in one line
percent=$(awk "BEGIN { pc=100*${var1}/${var2}; i=int(pc); print (pc-i<0.5)?i:i+1 }") # Divide 2 Numbers and set varible to percent
Rename All Files with UPPERCASE letters to lowercase - linux
for i in $( ls | grep [A-Z] ); do mv -i $i `echo $i | tr 'A-Z' 'a-z'`; done
https://linuxconfig.org/rename-all-files-from-uppercase-to-lowercase-characters
Move all Files of one type recursively into one directory
find /var/www/html/wp-content/uploads/ -name '*.jpg' | xargs -I files mv files .
These are from installing Asterisk + FOP2 but I find them useful examples:
sed -i 's/\(^SELINUX=\).*/\SELINUX=disabled/' /etc/selinux/config sed -i 's/\(^upload_max_filesize = \).*/\120M/' /etc/php.ini sed -i 's/^\(User\|Group\).*/\1 asterisk/' /etc/httpd/conf/httpd.conf sed -i 's/AllowOverride None/AllowOverride All/' /etc/httpd/conf/httpd.conf
Grep for 2 things in same line
grep 'word1.*word2' logs
Sed Find and Replace Global
sed -i -e 's/foo/bar/g' filename
Replace Comment Symbol
sed -i '/2001/s/^/#/g' file (to ADD Comment #) sed -i '/2001/s/^#//g' file (to uncomment)
Expand Variable (Has to have Double Quotes outside entire string!)
sed -i -e "s/MASTER/$MASTER/g" /etc/mysql/my.cnf
Insert into new line after greping for X
sed -i '/X/a TEST' file
Insert Multiple New Lines after Greping for X
sed -i '/X/r input.txt' file
Append to end of Line where X is first word in line
sed -i '/^10.1.10.255/ s/$/ ve_vminfo delaypurple=vm_info:75/' /etc/xymon/hosts.cfg
Echo Quotes
echo "\"$1\",\"$2\",\"$3\",\"$4\"" "","","",""
Grep for IP Address
grep -oE "\b([0-9]{1,3}\.){3}[0-9]{1,3}\b"
ifconfig | grep -oE "\b([0-9]{1,3}\.){3}[0-9]{1,3}\b" | grep -v 127.0.0.1 | grep -v 255
ip -4 addr show eth0 | grep -oP '(?<=inet\s)\d+(\.\d+){3}'
Grep only first result
cat foo | grep bar | head -1
Grep into Array and parse Array - Double (( )) vs "()"
IP=($(echo hello))
for i in "${IP[@]}"
do
echo $1
done
Exclude Grep
cat foo | grep bar | grep -v excludedpattern
Grep for IP and DO when IP Found
#!/bin/bash
while [ -z "$IP" ];do
IP="$(ifconfig | grep -oE "\b([0-9]{1,3}\.){3}[0-9]{1,3}\b" | grep -v 127.0.0.1 | grep -v 255)"
done
if [ -n "$IP" ]; then
echo "$IP"
fi
Extract Value Between Double Quotes:
awk -F'"' '$0=$2'
Grep for 2 Strings:
netstat -tulpn | grep 'ntopng\|nprobe'
Sed - Change Variable after = Sign:
sed -i 's,^\(THISISMYVARIABLE[ ]*=\).*,\1'THISISMYVALUE',g' config.cfg
Rename a bunch of files removing part of the name:
rename 's/PART2REMOTE//g' *
Remove all () Brackets from filenames:
for i in *\(*\)*; do j=`echo $i |sed -e 's/[()]//g'`; mv "$i" "$j"; done
Remove all []Brackets from filenames:
for x in *[*; do mv -- "$x" "${x//[][]}"; done
Change Spaces to underscores (Directory or Files):
find -name "* *" -type d | rename 's/ /_/g' # do the directories first find -name "* *" -type f | rename 's/ /_/g'
Move all Files from Subdirectories to Current Directory
find . -type f -print0 | xargs -0 mv -t .
Echo text into file:
sudo sh -c 'echo "foo" >> /path/bar'
Remove Entire Line matching Variable with SED:
sed -i '/foo/d' /path/bar
Echo Timestamp to log:
echo $(date -u) >> log
Grep for Version Number:
egrep -o "([0-9]{1,}\.)+[0-9]{1,}" file
Grep for PID from PS AUX:
proc=apache
ps aux | grep $proc| awk '{print $2}' | head -1
Pass Output As Argument via Pipe & XArgs:
https://unix.stackexchange.com/a/503197/130767
command1 | xargs -I{} command2 {}