Sed is a stream editor. A stream editor is used to perform basic
text transformations on an input stream (a file or input from a pipeline).The
Contents of the file will not be altered.
An Example would be
sed ‘s/string1/string2/g’ inputFile > outputFile
A Few more Examples are
sed -n '404,480p' sample :Print
Lines Between 404 and 487 :
sed ’404,480d’ sample : Pint
Every Thing Except from 404 to 480 :
sed -e '1d' sample : Remove
the First List in the sample File (
Similarly Other Lines too )
sed -e '2,4d' sample : Remove
Lines from 2 to 4
sed -n -e '/Great/,/task/p' sample :
Print Lines Between 'Great' and 'task' from Sample File
sed -e 's/also/plso/g' sample : Replace
'also' with 'plso' globally
sed -e '2,4s/also/plso/g' sample :
Replace 'also' with 'plso' in between lines 2 and 4
sed '/Dragon/G' sample : Add a
Balnk Line under the line where the regular expression Dragon is found
sed '/Dragon/{x;p;x;G;}' sample : Add
a Balnk Line Above and under the line where the regular expression Dragon is
found
sed -n '$=' sample : Count Lines
sed 's/^[ \t]*//' sample : Remove the
Blank Lines From the File and Left allign
sed -e '/but/!s/also/pslo/g' sample : Replace all lines which contain also to plso but leave lines
that contain but
sed -e 's/also/plso/g;s/but/nut/g' sample : replace also with plso and but with nut
sed 10g sample : first 10 lines
sed q sample : First Line
sed '$!d' sample : print the Last Line
sed -n '$p' sample : Last Line
sed -n '8,12p' sample : print
lines from 8 to 12
sed -n '52p' sample : print Line
Number 52
sed '3 s/Great/Treat/g' sample :
Search and replace only in 3 Line
sed ‘1,4 s/Great/Treat/g'
sample : Search and Replace only from 1 to 4 lines
sed -f script.sed sample : Write all
the commands in Script.sed and exetute them
sed '5!s/also/plso/' sample : replace
also with plso leaving 5 line
sed '1~3d' sample : Delete
every 3 line starting from 1
sed '/pattern/d' sample : Delete
line when Matched
sed 's/unix/linux/' sample| sed 's/os/system/' : Multiple Sed Commands .
Piping the Output
sed '3 s/unix/linux/' sample : Replace
the String On Specific Line
sed 'p' sample : Diplicate the Lines
sed '/unix/ a "Add a new line"' sample : add a Line after you find a Match
sed '/unix/ i "Add a new line"' sample : Add a Line Before a Match
sed '/unix/ c "Change line"' sample : change a Line
sed 'y/ul/UL/' sample : transform
the Text
sed -e '/^$/d' sample : Fileter
Out Empty Lines
cat sample | sed -e 's/$/ mycomputer/' > sample : Add the computer named mycomputer to the end of every line in
file
Many more To Come ,Keep Looking
