commandlinefu.com is the place to record those command-line gems that you return to again and again.
You can sign-in using OpenID credentials, or register a traditional username and password.
Subscribe to the feed for:
For all lines, sum the columns following the first one, and then print the first column plus the sum of all the other columns.
This sums up the page count of multiple pdf files without the useless use of grep and sed which other commandlinefus use.
replaces "\n" with "+"
I can't put the last ^2 with seq, so I reverse it to delete the last +N. So for doing sum(N^2) you have to do sum((N+1)^2). Must be a better way.
In the file data.txt there is a single column of numbers. Sed adds a "+" between lines and xargs prepares the output for bc. The "echo 0" is to avoid to have a "+" at the beginning of the line.
The original didn't use -print0 which fails on weird file names eg with spaces.
The original parsed the output of 'ls -l' which is always a bad idea.
The command gives size of all files smaller than 1024k, this information, together with disk usage, can help determin file system parameter (e.g. block size) or storage device (e.g. SSD v.s. HDD).
Note if you use awk instead of "cut| dc", you easily breach maximum allowed number of records in awk.
Adds up the total memory used by all Stainless processes: 1 Stainless, 1 StainlessManager and 1 StainlessClient per tab open.
More of the same but with more elaborate perl-fu :-)
Good for summing the numbers embedded in text - a food journal entry for example with calories listed per food where you want the total calories. Use this to monitor and keep a total on anything that ouputs numbers.