0 0 * * * curl http://www.commandlinefu.com/commands/random/plaintext -o /etc/motd -s -L

get a fresh commandlinefu-item each day as motd

Commandline-fu often has little tricks that I always forget. By adding this to the root-cron (sudo crontab -e) I lean a new trick every day.

2
By: theos
2013-11-19 13:53:00

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    0
    wget -qO - http://www.commandlinefu.com/feed/tenup | xmlstarlet sel -T -t -o '&lt;x&gt;' -n -t -m rss/channel/item -o '&lt;y&gt;' -n -v description -o '&lt;/y&gt;' -n -t -o '&lt;/x&gt;' | xmlstarlet sel -T -t -m x/y -v code -n
    fsilveira · 2009-08-14 02:44:00 0
  • If you want to operate on a set of items in Bash, and at least one of them contains spaces, the `for` loop isn't going to work the way you might expect. For example, if the current dir has two files, named "file" and "file 2", this would loop 3 times (once each for "file", "file", and "2"): for ITEM in `ls`; do echo "$ITEM"; done Instead, use a while loop with `read`: ls | while read ITEM; do echo "$ITEM"; done Show Sample Output


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    ls | while read ITEM; do echo "$ITEM"; done
    fletch · 2009-03-22 23:33:13 4

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    tail -n 1000 access.log | grep "200 POST" | awk '{print substr($3,0,9)}' | awk '{data[$0]++}END{for(item in data){print item, data[item]}}'
    hefei1986 · 2013-08-19 08:15:33 0
  • This command will play back each keystroke in a session log recorded using the script command. You'll need to replace the ^[ ^G and ^M characters with CTRL-[, CTRL-G and CTRL-M. To do this you need to press CTRL-V CTRL-[ or CTRL-V CTRL-G or CTRL-V CTRL-M. You can adjust the playback typing speed by modifying the sleep. If you're not bothered about seeing each keypress then you could just use: cat session.log Show Sample Output


    0
    (IFS=; sed 's/^[]0;[^^G]*^G/^M/g' <SessionLog> | while read -n 1 ITEM; do [ "$ITEM" = "^M" ] && ITEM=$'\n'; echo -ne "$ITEM"; sleep 0.05; done; echo)
    jgc · 2010-01-20 16:11:32 2
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    3
    open R,"curl -s http://feeds2.feedburner.com/Command-line-fu|xml2|"; while(<R>){ chomp; m(^/rss/channel/item/title=) and do{ s/^.*?=//; ($t,$d,$l)=($_,undef,undef) }; m(^/rss/channel/item/description=) and do{ s/^.*?=//; push @d,$_ }; m(^/rss/channel/item
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  • Useful to crawl where the javascript is declared, and extract it a common file. You can redirect it to a file to review item by item. Show Sample Output


    2
    grep -r "<script" | grep -v src | awk -F: '{print $1}' | uniq
    sucotronic · 2014-07-23 06:24:31 3

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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