Unix tricks • Hacker News Board

Re: Unix tricks

#21

Post by JoeAcchino » Thu, Mar 07, 2013, 3:12 PM UTC

niggler wrote: post #5

1) `pgrep` is a standard utility that does what his `psgrep` does and much much more. 2) htop is a cpu and memory hog -- every time I've used it I noticed it takes 6+% CPU time 3) there's an awk trick to do the `sort | uniq` recommendation that works on 10+GB files (single pass): awk '!x[$0]++' 4) Passwordless keys are dangerous -- use ssh-agent to save the password of the keys

3) if all the lines of the 10+GB file are actually unique, wouldn't awk keep the whole file in RAM? For files larger than my RAM could this leave my system unresponsive because it's thrashing on swap?

Re: Unix tricks

#22

Post by jameswyse » Thu, Mar 07, 2013, 3:13 PM UTC

ciupicri wrote: post #3

> SMB is better than NFS. More details would be nice.

I've found NFS to use much less cpu than SMB (on raspberry pis running XBMC at least)

Re: Unix tricks

#23

Post by globalpanic » Thu, Mar 07, 2013, 3:15 PM UTC

find . -name "file-wildcard" -exec "string" {} ";" -print

is something I use a lot - plus xargs sometimes

Re: Unix tricks

#24

Post by carlesfe » Thu, Mar 07, 2013, 3:15 PM UTC

bramswenson wrote: post #11

SMB is better than NFS in Unix Tricks? Shame Shame Shame. Possibly just wrong. Like the rest though. Thanks!

I know, that's controversial... but I've had zero problems with SMB and many ones with NFS. Just my two cents.

Re: Unix tricks

#25

Post by btipling » Thu, Mar 07, 2013, 3:15 PM UTC

nathanstitt wrote: post #15

Whut? ctrl-r? How have I missed that? No more 'history|grep foo' for me!

Also ag is faster and better than grep: https://github.com/ggreer/the_silver_searcher

Re: Unix tricks

#26

Post by pavel_lishin » Thu, Mar 07, 2013, 3:16 PM UTC

nathanstitt wrote: post #15

Whut? ctrl-r? How have I missed that? No more 'history|grep foo' for me!

Try this in your .inputrc:

    # Bind the up arrow to history search, instead of history step
    "\e[A": history-search-backward
    "\e[B": history-search-forward

No more "^rls" to search for ls in your bash history; just type "ls" and start hitting the up arrow.

Re: Unix tricks

#27

Post by Symmetry » Thu, Mar 07, 2013, 3:16 PM UTC

Lots of good tricks, though I replaced a lot of them with "Use fish instead of bash" http://ridiculousfish.com/shell/

Re: Unix tricks

#28

Post by [deleted] » Thu, Mar 07, 2013, 3:18 PM UTC

[deleted]

Re: Unix tricks

#29

Post by adlpz » Thu, Mar 07, 2013, 3:19 PM UTC

carlesfe wrote: post #2

So happy to see this on HN! Actually I took most of the tips from unix threads here and r/commandline, I highly recommend that subreddit if you like this kind of tricks! Edit: also, @climagic: https://twitter.com/climagic Second edit: I'm enhancing the file with these comments, so if there are any inconsistencies between the txt and a commenter, it's my fault.

Hostiàs! Topopardo! I used to follow your podcasts long ago :D. Anyway, nice list of tips.

Re: Unix tricks

#30

Post by cowmix » Thu, Mar 07, 2013, 3:19 PM UTC

jameswyse wrote: post #22

ciupicri wrote: post #3

> SMB is better than NFS. More details would be nice.

I've found NFS to use much less cpu than SMB (on raspberry pis running XBMC at least)

I second this..

If you use any NAS device with a weak CPU and you have a choice of CIFS or NFS, the NFS transfer rates are normally 25% faster and the load is much less on the server.