Page tree

Welcome to FreeSoftwareServers Confluence Wiki

Skip to end of metadata
Go to start of metadata

You are viewing an old version of this page. View the current version.

Compare with Current View Page History

« Previous Version 33 Current »

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
  • No labels