Kenneth at 22:30, 25 September 2018

2018-09-25T22:30:38Z

New page

Delete empty lines, and search lines:
$ sed '/^$/d' /tmp/data.txt
$ sed '/^$/d' /tmp/data.txt > /tmp/output.txt
$ sed '/Windows/d' /tmp/data.txt > /tmp/output.data.txt

Multiple:
echo "ac" | sed 's/a/b/ ; s/c/d/'

In place edit:
sed -i 's/old/new' myfile.txt

Change found text:
's/{old value}/{new value}/g'
sed 's/some_text/new_text/' myfile.txt

<pre>
sed 's/string1/string2/g' # Replace string1 with string2
sed 's/$.*$1/\12/g' # Modify anystring1 to anystring2
sed '/ *#/d; /^ *$/d' # Remove comments and blank lines
sed ':a; /\\$/N; s/\\\n//; ta' # Concatenate lines with trailing \
sed 's/[ \t]*$//' # Remove trailing spaces from lines
sed 's/$[\\`\\"$\\\\]$/\\\1/g' # Escape shell metacharacters active within double quotes
seq 10 | sed "s/^/ /; s/ *$.\{7,\}$/\1/" # Right align numbers
sed -n '1000p;<acronym title="quit ASAP">1000q</acronym>' # Print 1000th line
sed -n '10,20p;<acronym title="quit ASAP">20q</acronym>' # Print lines 10 to 20
# Extract title from HTML web page
sed -n 's/.*<title>$.*$<\/title>.*/\1/ip;<acronym title="quit after match">T;q</acronym>'
</pre>

Remove last occurrence:
echo "/dir/" | rev | sed 's#/##' | rev # /dir
rev inputfile | sed 's/ /-/' | rev

Change ASCII 00 character: (using octal value) [https://www.cyberciti.biz/faq/unix-linux-sed-ascii-control-codes-nonprintable/]
sed -i "s/\o00/ /g" filename # change 00 to space
sed -i "s/\o00/\\n /g" filename # change 00 to new line

Change copyrights in several files:
sed -i.BAK -e '/Copyright.*Fusion/s/-20[0-9][0-9]//;/Copyright.*Fusion/s/$20[0-9][0-9]$/\1-2013/' `ls *.c`

References:
* [http://www.cyberciti.biz/faq/using-sed-to-delete-empty-lines/ Howto delete empty lines using sed command under Linux / UNIX]

== sed one-liners ==

[http://www.catonmat.net/blog/wp-content/uploads/2008/09/sed1line.txt sed one-liners (.txt)

* [[http://www.catonmat.net/blog/sed-one-liners-explained-part-one/ Famous Sed One-Liners Explained, Part I - good coders code, great reuse]

*[http://www.catonmat.net/blog/sed-one-liners-explained-part-two Famous Sed One-Liners Explained, Part II - good coders code, great reuse]

== Crazy ==

Remove the first two numbers from itunes songs: ("02 Rolling in the Deep.mp3" -> "Rolling in the Deep.mp3")
ls | awk '{print "mv \"" $0 "\" \"" $0 "\""}' | grep "^mv \"$[0-9]\+$" | sed 's/"[0-9]\{1,2\} /"/2' | sh

== Convert Line Ending ==

sed 's/^M$//' windows.txt > unix.txt
sed 's/\r$//' windows.txt > unix.txt

Linux/sed - Revision history

Kenneth at 22:30, 25 September 2018