'sed' is a stream editor. A stream editor is used to perform basic text
transformations on an input stream. It doesn't alter the file contents.
Format is
sed OPTIONS... [SCRIPT] [INPUTFILE...]
sed 's/He/She/' letter.txt
Here 'letter.txt' is a filename where 'He' will be replaced by 'She' and displayed in the screen. 's' is a separator.
'sed' makes a maximum of one change per line
To have multiple changes per line we have to use as follows
sed 's/He/She/g' letter.txt
Also 'sed' searches are case sensitive and hence in-order to make search in-case sensitive we have to use the command as follows
sed 's/He/She/gi' letter.txt
To make many changes on a file, we can use the command as
sed -e 's/He/She/gi' -e 's/handsome/beautiful/gi' letter.txt
To make changes only on particular lines then use
sed '2,6s/He/She/g' letter.txt
Here entire letter.txt will be displayed on the screen but only lines '2' and '6' will be replaced by 'He' to 'She'.
We can also give starting and ending word and search and replace the word in lines between words
sed '/Dear/,/waiting/s/He/She/gi' letter.txt
transformations on an input stream. It doesn't alter the file contents.
Format is
sed OPTIONS... [SCRIPT] [INPUTFILE...]
sed 's/He/She/' letter.txt
Here 'letter.txt' is a filename where 'He' will be replaced by 'She' and displayed in the screen. 's' is a separator.
'sed' makes a maximum of one change per line
To have multiple changes per line we have to use as follows
sed 's/He/She/g' letter.txt
Also 'sed' searches are case sensitive and hence in-order to make search in-case sensitive we have to use the command as follows
sed 's/He/She/gi' letter.txt
To make many changes on a file, we can use the command as
sed -e 's/He/She/gi' -e 's/handsome/beautiful/gi' letter.txt
To make changes only on particular lines then use
sed '2,6s/He/She/g' letter.txt
Here entire letter.txt will be displayed on the screen but only lines '2' and '6' will be replaced by 'He' to 'She'.
We can also give starting and ending word and search and replace the word in lines between words
sed '/Dear/,/waiting/s/He/She/gi' letter.txt
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