Daily Purpose sed commands

Replace Text : sed -e "s/Old/New/g"

Remove Text : sed -e "s/Text//g"

Remove Text From Front : sed -e "s/^Text//g"

Remove Text From End :
sed -e "s/Text\$//g"
sed -e 's/Text$//g'

Insert Text in Front : sed -e "s/^/Text/g"

Append Text to End :
sed -e "s/\$/Text/g"
sed -e 's/$/Text/g'

Truncate :
sed -e "s/Text.*//"
cut -c5-8

Downshift and Upshift :
tr '[A-Z]' '[a-z]'
tr '[a-z]' '[A-Z]'

Change Tabs to Spaces : sed -e "s/<tab>/ /g"

Change Multiple Spaces to a Single Space :
sed -e "s/  */ /g"

Change Whitespaces to a Single Space :
sed -e "s/[<tab><space>][<tab><space>]*/<space>/g"

Delete Leading Whitespaces:
sed -e "s/^[<tab><space>]*//g"

Delete Trailing Whitespaces:
sed -e 's/[<tab><space>]*$//g'

Delete Lines:
sed -e "/Text/d"
grep -v "Text"

Delete Empty Lines:
sed -e '/^*$/d'
sed -e '/^[<tab><space>]*$/d'

Delete First Line:
sed -e '1d'
sed -e '1,7d'

Delete Last Line : sed -e '$d'

Print First Line :
sed -n '1p'
sed -e '2,$d'
sed -e '1q'

Print Last Line :
sed -n '$p'

Delete Comments :
sed -e '/^#/d'
sed -e 's/#.*//'

Delete Text Between Keywords :
sed -e '/Keyword1/,/Keyword2/d'
sed -e '/^Keyword1$/,/^Keyword2$/d'

Extract Text Between Keywords :
sed -e '/^Keyword1$/,/^Keyword2$/!d'

Print Odd Lines : cat -n file |  sed -e '/.....[02468]/d' -e 's/^.......//'

Print Even Lines : cat -n file |  sed -e '/.....[13579]/d' -e 's/^.......//'

Read a File Backwards : cat -n file | sort -nr | sed 's/^.......//'

Convert < > into LTGT : cat $* | sed -e 's/</\&lt;/g' -e 's/>/\&gt;/g'