sed ‘:a;/0$/{N;s/\n//;ba}’ In a loop (branch ba to label :a), if the current line ends in 0 (/0$/) append next line (N) and remove inner newline (s/\n//). awk: awk ‘{while(/0$/) { getline a; $0=$0 a; sub(/\n/,_) }; print}’ Perl: perl -pe ‘$_.=<>,s/\n// while /0$/’ bash: while read line; do if [ ${line: -1:1} != “0” … Read more
Use tr: tr -d ‘^M’ < inputfile (Note that the ^M character can be input using Ctrl+VCtrl+M) EDIT: As suggested by Glenn Jackman, if you’re using bash, you could also say: tr -d $’\r’ < inputfile
Update: Starting with macOS Big Sur (11.0), sed now does support the I flag for case-insensitive matching, so the command in the question should now work (BSD sed doesn’t reporting its version, but you can go by the date at the bottom of the man page, which should be March 27, 2017 or more recent); … Read more
sed -i ‘8i This is Line 8’ FILE inserts at line 8 This is Line 8 into file FILE -i does the modification directly to file FILE, no output to stdout, as mentioned in the comments by glenn jackman.
sed -n ‘/^START=A$/,/^END$/p’ data The -n option means don’t print by default; then the script says ‘do print between the line containing START=A and the next END. You can also do it with awk: A pattern may consist of two patterns separated by a comma; in this case, the action is performed for all lines … Read more
Try grep -Fwf file2 file1 > out The -F option specifies plain string matching, so should be faster without having to engage the regex engine.
The sed on BSD does not support the \n representation of a new line (turning it into a literal n): $ echo “123.” | sed -E ‘s/([[:digit:]]*)\./\1\n next line/’ 123n next line GNU sed does support the \n representation: $ echo “123.” | gsed -E ‘s/([[:digit:]]*)\./\1\nnext line/’ 123 next line Alternatives are: Use a single … Read more
A simpler approach (outputs to stdout, doesn’t update the input file): sed ‘$ s/.$//’ somefile $ is a Sed address that matches the last input line only, thus causing the following function call (s/.$//) to be executed on the last line only. s/.$// replaces the last character on the (in this case last) line with … Read more
You could try using something like: sed -n ‘s/$/:80/’ ips.txt > new-ips.txt Provided that your file format is just as you have described in your question. The s/// substitution command matches (finds) the end of each line in your file (using the $ character) and then appends (replaces) the :80 to the end of each … Read more
To display a file that contains ANSI sequences, less -r typescript Or, less -R typescript To remove ANSI and backspace sequences from a file, creating a clean newfile, try: sed -r ‘:again; s/[^\x08]\x08\x1b\[K//; t again; s/\x1b_[^\x1b]*\x1b[\]//g; s/\x1B\[[^m]*m//g’ typescript >newfile How it works -r This turns on extended regular expressions. (On BSD systems, -r should be … Read more