xargs
Is a very useful program to take a list and run commands against that list.
Here is a really straightforward example of using xargs,
- -t will show you what xargs is about to execute before it executes it.
- -n1 limits the arguments passed by the directory to pass one argument, in this case one file name at a time.
Tin-Phams-iMac:PC tinpham$ ls | xargs -t -n1 md5 md5 planetary.doc MD5 (bash) = ab5970d50d67bcafe5c554387f76534e md5 Superman.jpg MD5 (cat) = cdefa50d737dfcf8dc57886ea1a758c4 Tin-Phams-iMac:bin tinpham$
Search & Replace inside of Files
Try to memorize this command,
find [folder] -type f | xargs -I {} grep -li "text" {}
find [folder] -type f {search the specified folder for all files, returns full path of each file}
| xargs -I {} grep -li "[text]" {} {piped into xargs to grep for all files containing specified text ignoring case}
{warning}More details should be added for this xargs command or if possible rewrite it in a way that is more clear.
{warning}
h2. Search & Replace inside of Files
Try to memorize this command,
{code:lang=html}find [folder] -type f | xargs -I {} grep -li "text" {} | xargs perl -pi -e 's/[text_to_search_for]/[text_to_search_for]/g'
find [folder] -type f {search the specified folder for all files, returns full path of each file}
| xargs -I {} grep -li "[text]" {} {piped into xargs to grep for all files containing specified text ignoring case}
| xargs perl -pi -e 's/[text_to_search_for]/[text_to_replace_with]/g' {pipe list of files and search/replace with specified text}
More details should be added for this xargs command or if possible rewrite it in a way that is more clear.
Disk Management
List directories from largest to smallest at the top level only.
du -sk * | sort
Long Running Processes
To write.
Other Useful Commands
digest -a md5 -v /path/to/file