linux Bash指令速查

#!/bin/bash
cp $1 $2
echo "Copy done"

#!/bin/bash
dir=../
ls $dir
var=Hello World
# -bash: World: command not found
var='Hello World'
echo $var # Hello World
newvar='More $var'
echo $newvar # More $var
newvar="More $var"
echo $newvar # More Hello World

myvar=$( ls /etc )
echo $myvar
# Documents Desktop ...

#!/bin/bash
# demonstrate variable scope 1.
var1=blah
export var1
./script2.sh

#!/bin/bash
let "a = 5 + 4"
echo $a # 9
let "a = $1 + 30"
echo $a # 30 + first command line argument
b=$(( $a + 3 ))
echo $b

#!/bin/bash
# Basic if statement
if [ $1 -gt 100 ]
then
echo Hey that\'s a large number.
pwd
fi
date

#!/bin/bash
# case example
case $1 in
start) # pattern 1
echo starting
;; # needed!
stop)
echo stoping
;;
restart)
echo restarting
;;
*)
echo don\'t know
;;
esac # needed!

#!/bin/bash
# Basic while loop
counter=1
while [ $counter -le 10 ]
do
echo $counter
((counter++))
done
names='Stan Kyle Cartman'
for name in $names
do
echo $name
done
for value in {1..5}
do
echo $value
done
echo "All done"

# & means run in backstage
# nohup means not stopping running after the terminal is dead
# > means redirect output to file
$ nohup ./run.sh & > out.log
# show output on the screen and also output to file
$ ./run.sh | tee out.log