1. How to remove lines ending with ‘baddump’ from a text file:
You’ve got a file with a bunch of lines end with “baddump” and you need those lines to be removed completely without leaving any blank lines behind? This is the command to do it:
sed -i '/baddump$/d' file
2. You have text files with tons of empty lines and you want to get rid of those in one second?
sed '/^$/d' file > new_file
You may have multiple html files to correct at the same time.You can do that with
foreach file (*html)
sed '/^$/d' $file > new_files
mv new_files $file
3. Add character to the beginning of each line using sed:
In this example I will show you how to add a character to the beginning of each line using a sed command
Let’s create example file with some text:
The command to do the job is:
sed 's/^/#/' file
4. Deleting lines starting with X character:
Do you have a file and you want to delete lines starting with certain characters?
sed '/^#/d' file
This command will delete all lines that starts with # character.
5. Removing a character using sed:
You have a text file and you want to remove the character “%” from the text file using sed ?
sed 's/%//' file > newfile
6. Deleting one or more lines from a file using sed:
Here is how to remove one or more lines from a file:
Remove the 4rd line:
sed '4d' file
Remove the last line:
sed '$d' file
Remove the interval between lines 1 and 20:
sed '1,20d' file
7. Search & Replace text in multiple files recursively using sed and find:
The following command will recursively find all files with extension .html starting with the current folder and replace xxx string with zzz.
find . -name "*.html" -print | xargs sed -i 's/xxx/zzz/g'