LinuxQuestions.org - dinakumar12

converting all Lower chareacters to Upper and vice versa using sed

Posted 03-27-2014 at 05:30 AM by dinakumar12

sed -i 's/$.*$/\U\1/' samplefile #This converts the contents of samplefile (filename) from Lower to upper

sed -i 's/$.*$/\L\1/' samplefile #This converts the contents of samplefile (filename) from Upper to Lower

dinakumar12

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Simple script to delete last n lines

Posted 10-29-2013 at 10:53 AM by dinakumar12
Updated 12-31-2013 at 01:18 AM by dinakumar12

This may be possible using a single command but a very small and simple script though.Here we are deleting last 3 lines from a file.

#!/bin/bash
#Assign the number of lines to be deleted to variable "a"
a=3
i=1
while [ $i -le $a ]
do
sed -i '$d' file
i=$(($i + 1))
done

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simple script for creating 100 users in linux

Posted 01-17-2012 at 07:35 AM by dinakumar12
Updated 01-20-2012 at 02:36 AM by dinakumar12

#!/bin/bash
a=1
while [ $a -le 101 ]
do
{
useradd user$a
a=`expr $a + 1`
}
done

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one time changing of default user's home directory while adding newuser

Posted 01-17-2012 at 05:28 AM by dinakumar12

vim /etc/default/useradd

Look for this line

HOME=/home

change /home to your own directory

save the file and try adding new user by useradd username

Now the new user should be created with your own preferred directory.

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How to insert a string at the top of a file using sed

Posted 01-17-2012 at 05:22 AM by dinakumar12
Updated 01-18-2012 at 09:42 AM by dinakumar12

sed -i 1i\string filename

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