Linux shell指令碼程式設計基礎之練習篇

shell指令碼程式設計基礎之練習篇。

#!/bin/bash

if [ $# -ne 1
]then
echo
"請輸入乙個引數
"exit
else
echo
"引數正確
"newfile=$1fi#
echo `grep
"^#\!"$`
if ! grep
"^#\!
" $ &>/dev/null
then
cat >>$<#!/bin/bash
# author: inert your name here.
#date & time: `date +"
%f %t"`
#description: please edit here.
eoffi
vi +5 $

將指令碼改個名字例如：newshfile，將其放置在/bin/目錄下，那麼你的系統就多了乙個新的newshfile命令了

#!/bin/bash

# author: inert your name here.
#date & time: 2015-06-02
20:37:07
#description: please edit here.
let 
sum=0
for index in 
doif [ $[ $%2 ] == 0 ]; then
#let 
sum+=$
sum=`expr $ +$`
fidone
echo
"sum=$
"let 
sum=0
for num in $(seq
1100); do
if [ $[ $num % 2 ] == 0 ]; then
sum=`expr $sum +$num`
fidone
echo
"sum=$sum
"

#!/bin/bash

if [ $# -eq 2
]then
echo
"引數個數 $#\n
"echo
"引數相加 $1 + $2 = `expr $1 + $2`
"else
echo
"引數個為 $#，本指令碼需要兩個引數
"fi

#!/bin/sh

num=5
while test $num != 0
doecho
"$num
"num=`expr $num - 1
`done
echo
"*****************************
"num=5
while (($num != 0
))do
echo
"$num
"num=`expr $num - 1
`done
echo
"*****************************
"for num in 
doecho
"$num
"done
echo
"*****************************
"for ((num=5;$num>0;num=`expr $num - 1
`))do
echo
"$num
"done

#!/bin/bash

# author: inert your name here.
#date & time: 2015-06-02
21:32:51
#description: please edit here.
if test $# == 3
then
echo
"引數個數$#，引數：$@
"case $1
in        +)
num=`expr $2 + $3
`        ;;
-)num=`expr $2 - $3
`        ;;
x)num=`expr $2 \* $3
`        ;;
/)num=`expr $2 \/ $3
`        ;;
*)echo
"只允許+ - x /這幾個運算子";;
esac
echo
"num=$num
"else
echo
"引數個數為3個，分別為\"運算子 引數1 引數2\"
"fi

echo 5.12 + 2.5 | bc

#!/bin/bash

# author: inert your name here.
#date & time: 2015-06-02
22:07:28
#description: please edit here.
a=5.66
b=8.67
c=`echo $a + $b |bc`
echo
"$a + $b = $c
"

1

22333
4444
55555
****************************112
1231234
12345
****************************
|_||_
|||_
||||_
|||||_
****************************
* * *
* * *
* * * *
* * * * *
* * * * *
* * * *
* * *
* **************lengxing****************
** *
* * *
* * * *
* * * * *
* * * * * *
* * * * *
* * * *
* * *
* **

#!/bin/bash

# author: inert your name here.
#date & time: 2015-06-02
22:24:41
#description: please edit here.
for ((num=1;$num<=5;num=`expr $num + 1
`))do
for((index=$num;$index>0;index=`expr $index - 1
`))        
doecho -n "
$num
"done
echo
""done
echo
"****************************
"for ((num=1;$num<=5;num=`expr $num + 1
`))do
for((index=1;$index<=$num;index=`expr $index + 1
`))        
doecho -n "
$index
"done
echo
""done
echo
"****************************
"for ((num=1;$num<=5;num=`expr $num + 1
`))do
for((index=1;$index<=$num;index=`expr $index + 1
`))        
doif [ $index%2 == 0 ]; then
echo -n "
"else
echo -n "|"
fidone
echo -n "_"
echo
""done
echo
"****************************
"for (( i=1; i<=5; i++))
dofor (( j=1; j<=i;  j++))
doecho -n "*"
done
echo
""done
for (( i=5; i>=1; i--))
dofor (( j=1; j<=i;  j++))
doecho -n "*"
done
echo
""done
echo
"************lengxing****************
"max=6
for ((i=1; i<=$max; i++))
dofor ((j=$max-i; j>0; j--))
doecho -n "
"done
for ((k=1; k<=i; k++))
doecho -n "*"
done
echo
""done
for ((i=1; i<=$max; i++))
dofor ((k=1; k<=i; k++))
doecho -n "
"done
for ((j=$max-i; j>0; j--))
doecho -n "*"
done
echo
""done

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