Linux/sed
< Linux
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
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>'
Remove last occurrence:
echo "/dir/" | rev | sed 's#/##' | rev # /dir rev inputfile | sed 's/ /-/' | rev
Change ASCII 00 character: (using octal value) [1]
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:
sed one-liners
[http://www.catonmat.net/blog/wp-content/uploads/2008/09/sed1line.txt sed one-liners (.txt)
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