$ uname
CYGWIN_NT-5.1

$ type echo for ls
echo is a shell builtin
for is a shell keyword
ls is hashed (/usr/bin/ls)

$ type time

$ /usr/bin/time ls > hoge.txt 2>&1

$ ( time ls ) > hoge.txt 2>&1

$ date

$ echo -n `date`

$ perl -ne '{ print if m/aaa|bbb/ }' *.txt

$ egrep "aaa|bbb" *.txt

$ grep -E "aaa|bbb" *.txt

$ kill %1

$ sed 's/aaa/bbb/' hoge.txt > hoge.txt

$ ls > a

$ id

$ hostname

$ vmstat 1 | tee text.txt

$ awk -F, '{ print $1 $NF }' text.csv

$ jobs

$ jobs -l

$ kill -s STOP 番号

$ %

$ time コマンド

$ cat /etc/hosts

$ grep -l 'my' *

$ find . -type f

$ ls -R

$ env LANG=C diff -rc OLD NEW | sort | grep 'diff' > tmp.txt
$ env LANG=C diff -rc OLD NEW | sort | grep 'Only in' >> tmp.txt

$ perl -i.bak -p -e '' ./jikken_perl/*

cat temp.txt | grep "err" | cut -d " " -f 6 | uniq | cut -d "." -f 2

export HOGE="hogehoge"

$ bash a.sh

$ echo $HOGE

$ . a.sh

$ echo $HOGE
hogehoge

#!/bin/sh

if [ -f $HOME/a ]; then
    exec ls a;
else
    echo not found;
fi

$ bash b.sh

$ . b.sh

if [ -f $HOME/a ]
then
	exec hogehoge

if [ -f $HOME/a ]; then
	exec hogehoge