sed -n ‘10000000,10000020p’ filename You might be able to speed that up a little like this: sed -n ‘10000000,10000020p; 10000021q’ filename In those commands, the option -n causes sed to “suppress automatic printing of pattern space”. The p command “print[s] the current pattern space” and the q command “Immediately quit[s] the sed script without processing … Read more
If you are on a OS X, this probably has nothing to do with the sed command. On the OSX version of sed, the -i option expects an extension argument so your command is actually parsed as the extension argument and the file path is interpreted as the command code. Try adding the -e argument explicitly and giving ” as argument to -i: See this.
Maybe something like this: Replace ~ with a character that you know won’t be in the string.
\b in regular expressions match word boundaries (i.e. the location between the first word character and non-word character):
You can use tail command as follows: Now last 100 lines will be present in newLogfile EDIT: More recent versions of tail as mentioned by twalberg use command:
You can use tail command as follows: Now last 100 lines will be present in newLogfile EDIT: More recent versions of tail as mentioned by twalberg use command:
You want awk. This would be a quick and dirty hack: awk -F “\”” ‘{print $2}’ /tmp/file.txt
How do I find and replace every occurrence of: with in every text file under the /home/www/ directory tree recursively?
The problem is with slashes: your variable contains them and the final command will be something like sed “s/string/path/to/something/g”, containing way too many slashes. Since sed can take any char as delimiter (without having to declare the new delimiter), you can try using another one that doesn’t appear in your replacement string: Note that this … Read more
sed is a stream editor. It works with streams of characters on a per-line basis. It has a primitive programming language that includes goto-style loops and simple conditionals (in addition to pattern matching and address matching). There are essentially only two “variables”: pattern space and hold space. Readability of scripts can be difficult. Mathematical operations are … Read more