Tech Talks

#!/bin/bash # Concatenate two passwords files. The resulting will contain entries of the first file with UID < 500 and that of second with UID > 500 DATE=`date +%d.%m.%Y` TIME=`date +%H.%M.%S` echo Name of File 1 read f1 echo Name of File 2 read f2 echo Name for New file read newfile mv $newfile $newfile.bak.$DATE.$TIME ## Manipulate first file count=`cat $f1 | cut -f3 -d : | sort -n | wc -l` h=1 while [ "$count" -ge "$h" ] do { id=`head -$h $f1 | tail -1 | cut -f3 -d:` if [ $id -lt "500" ] then { head -$h $f1 | tail -1 >> $newfile } fi h=$[$h + 1 ] } done ## file 2 count=`cat $f2 | cut -f3 -d : | sort -n | wc -l` count=$(`expr 'cat count'`) h=1 while [ "$count" -ge "$h" ] do { id=`head -$h $f2 | tail -1 | cut -f3 -d:` if [ $id -gt "499" ] then { username=`head -$h $f2 | tail -1 | cut -f1 -d:` grep $username: $newfile if

#!/bin/bash # Change the GID of a Group and make it effective for all the members in /etc/passwd pwfile=/etc/passwd grpfile=/etc/group DATE=`date +%d.%b.%Y` TIME=`date +%H.%M.%S` echo Creating backups $pwfile.$DATE.$TIME and $grpfile.$DATE.$TIME cat $pwfile > $pwfile.$DATE.$TIME cat $grpfile > $grpfile.$DATE.$TIME echo Enter group name read gname cgid=`grep $gname $grpfile | cut -f3 -d:` username_s=`cat $pwfile | grep $cgid | cut -f1 -d:` echo Following users will be affected echo "##############" echo $username_s echo "##############" echo Enter new GID read ngid ## Change the GID of the group groupmod -g $ngid $gname ## Change GID(s) in passwd file uidc=`grep $cgid $pwfile | cut -f3 -d: | wc -l` uidh=1 while [ "$uidc" -ge "$uidh" ] do { id=`head -$uidh uid | tail -1` sed 's/'$id':'$cgid'/'$id':'$ngid'/g' $pwfile > $pwfile.new cat $pwfile.new > $pwfile uidh=$[$uidh + 1 ] } done

#!/bin/bash ## BASH Script to Run any System command ##### ## Script should be initialized as ./script.sh arg1 arg2 arg3,.... ## echo "Commands with spaces should be supplied as \`COMMAND OPTIONS\`." ## echo "For example "./runcdms.sh \`mkdir test\` \`chmod 777 test\`"" for i in `$*` do #sudo - u root $i ## You can sudo if you are not root $i done

#!/usr/bin/env bash ## Ping all machines in a Network PING="$(which ping) -c 1 -W 1" echo "Enter Subnet(eg:192.168.0)" read Subnet echo "Do you want to PING the entire network or a RANGE of IPs ? Enter your choice" echo 1. Ping Entire Network echo 2. Ping a RANGE read choice if [ $choice = 1 ]; then { echo Pinging..... for((i=1;i<255;i++)); do ${PING} ${Subnet}.${i} > /dev/null 2> /dev/null if [ $? -eq 0 ]; then echo -e "${Subnet}.${i} is up" fi done } fi if [ $choice = 2 ]; then { echo Enter the Starting IP of Range read a echo Enter the Last IP of Range read b echo Pinging..... for((i=$a;i<$b;i++)); do ${PING} ${Subnet}.${i} > /dev/null 2> /dev/null if [ $? -eq 0 ]; then echo -e "${Subnet}.${i} is up" fi done } fi exit 0