[[nomeaning/演習問題]]

== fileの中身 ==
{{{
cat ~nomeaning/Public/unix-seminar/file.txt
}}}

== find the keyword ==
{{{
find ~nomeaning/Public/unix-seminar/k/ -type f -name '*keyword*'
}}}

== grep the keyword ==
{{{
find ~nomeaning/Public/unix-seminar/k/ -type f | xargs grep Keyword
}}}

== Kernel version ==
{{{
uname -r 
}}}

== wc ==
{{{
grep a\\.out ~nomeaning/Public/unix-seminar/file2.txt | wc -l
}}}

== md5sum ==
{{{
md5sum ~nomeaning/Public/unix-seminar/file.txt  
}}}

== long file ==
{{{
head -12345321 ~nomeaning/Public/unix-seminar/lf.txt | tail -1
}}}

== Send the signal ==
{{{
cp ~nomeaning/Public/unix-seminar/a.out a.out && ./a.out &

killall -SIGUSR1 a.out
}}}

== Languages ==

{{{
for lang in c cc cpp rb py hs java
do
    echo $lang
    find ~nomeaning/Public/unix-seminar/langs/ -type f -name \*\.$lang | xargs cat | wc -l
done
}}}

↓szhideとmizunashiに撃墜されたコード

{{{
for lang in c cc cpp rb py hs java
do
    echo $lang
    find ~nomeaning/Public/unix-seminar/langs/ -type f -name \*\.$lang | xargs wc -l | tail -1
done
}}}

== Active! ==
{{{
c=0
for mail in /ml/mma-active/article/2013_Apl/*.gz 
do
  if zgrep nomeaning $mail > /dev/null
  then
    c=`expr $c + 1`
  fi
done
echo $c
}}}

↓ytokuさんに撃墜されたコード
{{{
zgrep nomeaning /ml/mma-active/article/2013_Apl/*.gz | wc -l
}}}

== Mailer ==
{{{
zcat /ml/mma-active/article/2012_*/*.gz | grep -E \^\(X-Mailer\|User-Agent\) | cut -d ' ' -f 2 | ruby -e 'hist = Hash.new(0); STDIN.read.split("\n").each{|mailer| hist[mailer] += 1}; hist.each {|k, v| puts "#{k} #{v}"}' | sort -rn -k2
}}}

"sort | uniq -c"で出現頻度とれたらしい（ytokuさんより）。Rubyいらなかった。

↓そういう方針でやってみた
{{{
zcat /ml/mma-active/article/2012_*/*.gz | grep -E \^\(X-Mailer\|User-Agent\) | cut -d ' ' -f 2 | sort | uniq -c | sort -rn   
}}}