Split: Split a text file in half (or any percentage) on Ubuntu Linux
The following command splits access.log files into multiple files with 6000 lines each
split -l 6000 access.logSplit files into size of 5M each
split --bytes 5M --numeric-suffixes --suffix-length=3 foo.mysql last_part.mysqlDiff : Get Difference between files and folders
Following command provides recursive difference
diff -r dir1/ dir2/Sed: To delete lines matching a string in a file
sed --in-place '/url_alias/d' some_db.mysqlDeletes all lines matching url_alias string in some_db.mysql file
Replace strings in file with another:
sed -i 's/old-word/new-word/g' *.txtReplaces old-word with new-word with all txt extension files in the directory. i is for ignore case.
Grep: Used for string search across files in directories. The following handy command searches for specific string in a specified file recursively in the location provided.
grep -rn search_string -A 1 -B 3 --include=settings.php /srv/www/where location to recursively search is /srv/www/ and the string is searched only on a specific file settings.php. Also the option -A 1 specifies to print one line above the line where the string is found in the file and -B 3 specifies printing 3 lines below the searched string line.
Additionally grep comand can be combined with the find command as follows
find /srv/www/ -name settings.php -exec grep -n -A 1 -B 3 -H search_string {} \;du: Disk Usage
Display the disk usage for all one level of directories
du -h --max-depth=1--
Source
http://www.howtogeek.com/howto/ubuntu/split-a-text-file-in-half-or-any-p...
http://www.cyberciti.biz/faq/unix-linux-replace-string-words-in-many-files/
http://www.tecmint.com/check-linux-disk-usage-of-files-and-directories/
http://linux.about.com/library/cmd/blcmdl1_du.htm