sed >
Stream editor allow filter and transform texts, find pattern and replace with
whatever is that you want to replace with, it's like search and replace.
You can
use other separators instead of slashes (/). Example pipe | or hash #
1 - sed
substitution -- s for substitution. replaces only the first occurrence in each
line of the file and save to a new file
sed
's/word/newword/' < oldfile > newfile
2 -
replaces every occurrence of 'word'. g for global
sed
's/word/newword/g' < oldfile > newfile
3 - grab
input from command and change it. It's searching for strings and not words
echo
"Renata" | sed 's/Renata/Renny/'
echo
"Renata Brownish" | sed 's/Brown/Red'
4 -
Using -i flag changes will be made in the original file
sed -i
's/word/newword/g' filename
5 - find
all the lines with a specific 'Pattern' and substitute a word in that line with
new word.
Find the pattern
first, then substitute
the word 'that' in the
lines where you find my pattern with 'THAT'
sed
'/pattern/s/that/THAT/' myfile.txt ---- only first occurrence in the line
sed
'/pattern/s/that/the/g' myfile.txt ----every occurrence in the line
6 -
Delete the lines that appear the pattern / word 'unique' - it's not a
persistent delete though unless you use the flag -i
sed
'/unique/d' myfile.txt
Delete an exact match from
/etc/hosts file: Use -i flag to make it persistent
sed
'/nsp-edge-drcn.platform.dbankcloud.cn/d' test-hosts.txt
sed
'/192.98.85.100/d' ips.txt
