oneliners-sed.sh

oneliners-sed.sh

# extract all the links from firefox bookmarks export
# the following uses grep to get both http, https url
# then uses sed - non-greedy match to extract the link alone

grep 'HREF="http' bookmarks.html | sed -e 's,.*HREF="\([^"]*\)".*,\1,g'  | sort | less

# replace a bunch of lines in the middle of a file with ... blah ...
cat 40lines.txt | sed -e '6,34d; 35{i ... blah ...' -e 'd}'
cat 40lines.txt | sed -e '6,33d; 34,36s,.*,,;35s//     ... blah .../'

# replace with contents from a file 
echo -e "line 1\nline 2\nline 3" > replace.txt
cat 40lines.txt | sed -e '6,35{R replace.txt' -e 'd}'

# see here - https://unix.stackexchange.com/questions/405715/using-sed-to-replace-first-n-lines-in-a-file-with-the-first-n-lines-from-another

# 40 lines are generated using
curl -sk http://metaphorpsum.com/sentences/40 | gawk 'BEGIN {RS="."} { gsub(/^ /,"", $0); printf "%2d %s\n", NR, $0}' > 40lines.txt