linux脚本实现加减乘除运算

1. shell 脚本里面从一个文本里面读出一个数字，如何转换成整数我需要用这个数字进行加减乘除

可以参考下面几种方法：

法一：

echo ${var%.*} #这个是直接去除小数点及后面所有内容，只用于bash

法二：

echo $var | awk -F. '{print $1}' #以小数点为分隔符取第一个字段

法三：

echo $var | awk '{print int($0)}' #awk中可直接使用C函数取整

(1)linux脚本实现加减乘除运算扩展阅读：

shell脚本

shell script是利用shell的功能所写的一个程序，这个程序是使用纯文本文件，将一些shell的语法与指令写在里面，然后用正规表示法，管道命令以及数据流重导向等功能，以达到我们所想要的处理目的。

更明白地来说，shell script就像早期dos年代的.bat，最简单的功能就是将许多指令汇整写一起，让使用者很容易地就能够一个操作执行多个命令。

2. 在Linux下，用shell编写一个简单的计算器，要实现加减乘除4个功能就行了

不用写吧，本来有个 bc 命令可用，没有下载就成.
非要写一个，zsh 的function里有一个，名 zcalc,
贴上来给你

#!/usr/bin/zsh -i
#
# Zsh calculator. Understands most ordinary arithmetic expressions.
# Line editing and history are available. A blank line or `q' quits.
#
# Runs as a script or a function. If used as a function, the history
# is remembered for reuse in a later call (and also currently in the
# shell's own history). There are various problems using this as a
# script, so a function is recommended.
#
# The prompt shows a number for the current line. The corresponding
# result can be referred to with $<line-no>, e.g.
# 1> 32 + 10
# 42
# 2> $1 ** 2
# 1764
# The set of remembered numbers is primed with anything given on the
# command line. For example,
# zcalc '2 * 16'
# 1> 32 # printed by function
# 2> $1 + 2 # typed by user
# 34
# 3>
# Here, 32 is stored as $1. This works in the obvious way for any
# number of arguments.
#
# If the mathfunc library is available, probably understands most system
# mathematical functions. The left parenthesis must be adjacent to the
# end of the function name, to distinguish from shell parameters
# (translation: to prevent the maintainers from having to write proper
# lookahead parsing). For example,
# 1> sqrt(2)
# 1.4142135623730951
# is right, but `sqrt (2)' will give you an error.
#
# You can do things with parameters like
# 1> pi = 4.0 * atan(1)
# too. These go into global parameters, so be careful. You can declare
# local variables, however:
# 1> local pi
# but note this can't appear on the same line as a calculation. Don't
# use the variables listed in the `local' and `integer' lines below
# (translation: I can't be bothered to provide a sandbox).
#
# Some constants are already available: (case sensitive as always):
# PI pi, i.e. 3.1415926545897931
# E e, i.e. 2.7182818284590455
#
# You can also change the output base.
# 1> [#16]
# 1>
# Changes the default output to hexadecimal with numbers preceded by `16#'.
# Note the line isn't remembered.
# 2> [##16]
# 2>
# Change the default output base to hexadecimal with no prefix.
# 3> [#]
# Reset the default output base.
#
# This is based on the builtin feature that you can change the output base
# of a given expression. For example,
# 1> [##16] 32 + 20 / 2
# 2A
# 2>
# prints the result of the calculation in hexadecimal.
#
# You can't change the default input base, but the shell allows any small
# integer as a base:
# 1> 2#1111
# 15
# 2> [##13] 13#6 * 13#9
# 42
# and the standard C-like notation with a leading 0x for hexadecimal is
# also understood. However, leading 0 for octal is not understood --- it's
# too confusing in a calculator. Use 8#777 etc.
#
# Options: -#<base> is the same as a line containing just `[#<base>],
# similarly -##<base>; they set the default output base, with and without
# a base discriminator in front, respectively.
#
#
# To do:
# - separate zcalc history from shell history using arrays --- or allow
# zsh to switch internally to and from array-based history.

emulate -L zsh
setopt extendedglob

local line ans base defbase forms match mbegin mend psvar optlist opt arg
local compcontext="-math-"
integer num outdigits outform=1
# We use our own history file with an automatic pop on exit.
history -ap "${ZDOTDIR:-$HOME}/.zcalc_history"

forms=( '%2$g' '%.*g' '%.*f' '%.*E' )

zmodload -i zsh/mathfunc 2>/dev/null

: ${ZCALCPROMPT="%1v> "}

# Supply some constants.
float PI E
(( PI = 4 * atan(1), E = exp(1) ))

# Process command line
while [[ -n $1 && $1 = -(|[#-]*) ]]; do
optlist=${1[2,-1]}
shift
[[ $optlist = (|-) ]] && break
while [[ -n $optlist ]]; do
opt=${optlist[1]}
optlist=${optlist[2,-1]}
case $opt in
('#') # Default base
if [[ -n $optlist ]]; then
arg=$optlist
optlist=
elif [[ -n $1 ]]; then
arg=$1
shift
else
print "-# requires an argument" >&2
return 1
fi
if [[ $arg != (|\#)[[:digit:]]## ]]; then
print - "-# requires a decimal number as an argument" >&2
return 1
fi
defbase="[#${arg}]"
;;
esac
done
done

for (( num = 1; num <= $#; num++ )); do
# Make sure all arguments have been evaluated.
# The `$' before the second argv forces string rather than numeric
# substitution.
(( argv[$num] = $argv[$num] ))
print "$num> $argv[$num]"
done

psvar[1]=$num
while vared -cehp "${(%)ZCALCPROMPT}" line; do
[[ -z $line ]] && break
# special cases
# Set default base if `[#16]' or `[##16]' etc. on its own.
# Unset it if `[#]' or `[##]'.
if [[ $line = (#b)[[:blank:]]#('[#'(\#|)(<->|)']')[[:blank:]]#(*) ]]; then
if [[ -z $match[4] ]]; then
if [[ -z $match[3] ]]; then
defbase=
else
defbase=$match[1]
fi
print -s -- $line
line=
continue
else
base=$match[1]
fi
else
base=$defbase
fi

print -s -- $line

case ${${line##[[:blank:]]#}%%[[:blank:]]#} in
q) # Exit if `q' on its own.
return 0
;;
norm) # restore output format to default
outform=1
;;
sci[[:blank:]]#(#b)(<->)(#B))
outdigits=$match[1]
outform=2
;;
fix[[:blank:]]#(#b)(<->)(#B))
outdigits=$match[1]
outform=3
;;
eng[[:blank:]]#(#b)(<->)(#B))
outdigits=$match[1]
outform=4
;;
local([[:blank:]]##*|))
eval $line
line=
continue
;;
*)
# Latest value is stored as a string, because it might be floating
# point or integer --- we don't know till after the evaluation, and
# arrays always store scalars anyway.
#
# Since it's a string, we'd better make sure we know which
# base it's in, so don't change that until we actually print it.
eval "ans=\$(( $line ))"
# on error $ans is not set; let user re-edit line
[[ -n $ans ]] || continue
argv[num++]=$ans
psvar[1]=$num
;;
esac
if [[ -n $base ]]; then
print -- $(( $base $ans ))
elif [[ $ans = *.* ]] || (( outdigits )); then
printf "$forms[outform]\n" $outdigits $ans
else
printf "%d\n" $ans
fi
line=
done

return 0

支援小数点，+ - * / , ok

3. 1.linux系统下shell脚本用case语句编写四则运算 2.linux系统下shell脚本输入数字串。进行反序输出

原来我拿shell写的计算器：
[root@liuxiting testdir]# cat calculator.sh
#!/bin/bash
echo "usage: 1+3 <Enter> ,q <Enter> is quit"
while [ 1 ]
do
read -p "->>" str 1>>/dev/null
a=`echo $str |awk -F '+|-|*|/' '{print $1}'`
if [ $a == q ]
then
break
fi
b=`echo $str |awk -F '+|-|*|/' '{print $2}'`
o=`echo $str |grep -o "[[:punct:]]" | grep -v "\."`
case $o in
+) awk 'BEGIN{printf " =%.2f\n",'$a'+'$b'}';;
-) awk 'BEGIN{printf " =%.2f\n",'$a'-'$b'}';;
\*) awk 'BEGIN{printf " =%.2f\n",'$a'*'$b'}';;
/)if [ $b -eq 0 ]
then
echo 0 Can NOT be denominator!
continue
fi
awk 'BEGIN{printf " =%.2f\n",'$a'/'$b'}';;
#^) awk 'BEGIN{printf " =%.2f\n",'$a'**'$b'}';;
*) echo error;;
esac
done

刚刚写的倒序输出：
[root@liuxiting testdir]# cat XuShuChu.sh
#!/bin/bash
echo "usage: 123456 <Enter>, q <Enter> is quit"
while [ 1 ]
do
echo -n "Pleasw enter number : "
read n
if [ $n == 'q' ]
then
break
fi
sd=0
rev=""
on=$n
echo "$n"
while [ $n -gt 0 ]
do
sd=$(( $n % 10 )) # get Remainder
n=$(( $n / 10 )) # get next digit
rev=$( echo $rev$sd)
done
echo "$on in a reverse order $rev"
done

4. Linux+编写脚本程序,提示用户输入两个整数A和B,并计算“A+B”、“A-B”、“

Linux+编写脚本程序,提慎纤示用户输入两个整数A和B,并计算“A+B”、“A-B”、“的方法是：先用read命令读取用户输入的两个整数，然后用echo命令输出它们的和、埋丛差、积、商1。例如，你可以参考下面的代码：
#!/bin/bash#提示用户输入两个整数read -p "请输入两个整数：" a b#计算并输出两数的和、差、积、商echo "a+b=$[a+b]"echo "a-b=$[a-b]"echo "a*b=$[a*b]"#判断第二个整数是否为0，如果是则提示无法计算商值，否则弯孝樱输出商值if [ $b -eq 0 ]; then
echo "无法计算商值"else
echo "a/b=$[a/b]"fi

5. linux锷犲噺涔橀櫎锻戒护linux锷犲噺

linux涓嬫湁娌℃湁瀵逛竴鍒楁暟瀛楄繘琛屾眰鍜岀殑锻戒护锛

瀵圭涓鍒楁暟瀛楁眰鍜岋细awk'{a+=$1}END{printa}'

瀵圭浜屽垪鏁板瓧姹傚拰锛歛wk'{a+=$2}END{printa}'

阃氲繃绠￠亾阃佽繃铡伙细echoXXX|awk

鎴栬卆wk璇诲彇鏂囦欢

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Linux缃戠粶镎崭綔绯荤粺镄勯梾棰桡纴涓锛岀紪鍐檚hell鑴氭湰瀹炵幇锷犲噺涔橀櫎杩愮畻銆傚疄鐜版柟娉曚笉闄愶纴浣嗗敖鍙鑳藉噺灏戝嚭阌欐満鐜囷纻

setd=0;

if

then

echo$3

d=$(($1-$2))

fi

echo$d

linux甯哥敤锻戒护链夊摢浜涳纻

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01镆ョ湅鏂囦欢鎴栨棩蹇

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1銆乭ead

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headtest.log锛歵est.log鏂囦欢鍓嶅嚑琛屾棩蹇楀唴瀹

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2銆乼ail

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3銆乧at

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02链鍦板嶅埗

钖屼竴鍙版湇锷″櫒涓嶅悓鐩褰曚箣闂村嶅埗鏂囦欢鎴栫洰褰曚篃鏄缁忓父鐢ㄥ埌镄勚

1銆佸嶅埗鏂囦欢

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2銆佸嶅埗鏂囦欢澶

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娉锛-r鎴-R琛ㄧず寰鐜锛屽惊鐜鐩褰曚笅镓链夋枃浠跺拰鐩褰曘备笅闱㈡墍链夊懡浠や篃鏄濡傛ゃ

03杩灭▼澶嶅埗

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1銆佹湰鍦版湇锷″櫒澶嶅埗鍒拌繙绋嬫湇锷″櫒

(1)澶嶅埗鏂囦欢

锻戒护1锛

scplocal_fileremote_username@remote_ip:remote_folder

锻戒护2锛

scplocal_fileremote_username@remote_ip:remote_file

锻戒护3锛

scplocal_fileremote_ip:remote_folder

锻戒护4锛

scplocal_fileremote_ip:remote_file

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瀹炰緥1锛氢粠链鍦版湇锷″櫒澶嶅埗test.log镊192.168.130.130链嶅姟鍣ㄧ殑/home/geshan/鐩褰曪纴骞堕吨鏂板懡钖崭负

20190125.log

锻戒护锛

瀹炰緥2锛氢粠链鍦版湇锷″櫒澶嶅埗test.log镊192.168.130.130链嶅姟鍣ㄧ殑/home/geshan/鐩褰

锻戒护锛

(2)澶嶅埗鐩褰

锻戒护1锛

scp-rlocal_folderremote_username@remote_ip:remote_folder

锻戒护2锛

scp-rlocal_folderremote_ip:remote_folder

绗1涓鎸囧畾浜嗙敤鎴峰悕锛屽懡浠ゆ墽琛屽悗闇瑕佽緭鍏ョ敤鎴峰瘑镰侊绂绗2涓娌℃湁鎸囧畾鐢ㄦ埛钖嶏纴锻戒护镓ц屽悗闇瑕佽緭鍏ョ敤鎴峰悕鍜屽瘑镰併

瀹炰緥锛氢粠链鍦版湇锷″櫒/home/appuser/鐩褰曚笅镄则omcat鐩褰曞嶅埗鍒192.168.130.130链嶅姟鍣ㄧ殑/home/geshan/鐩褰曞懡浠わ细

2銆佷粠杩灭▼链嶅姟鍣ㄥ嶅埗鍒版湰鍦版湇锷″櫒

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(1)澶嶅埗鏂囦欢

瀹炰緥锛

浠192.168.130.130杩灭▼链嶅姟鍣ㄧ殑/home/geshan/璺寰勪笅test.log鏂囦欢澶嶅埗鍒版湰鍦版湇锷″櫒/home/appuser/璺寰

锻戒护锛

[email protected]:/home/geshan/test.log/home/appuser/

(2)澶嶅埗鐩褰

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锻戒护锛

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04铡嬬缉鍜岃В铡

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1銆乼ar锻戒护

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2銆乬z锻戒护

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3銆亃ip锻戒护

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4銆乺ar锻戒护

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05淇鏀规潈闄

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1銆乧hgrp锻戒护

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3銆乧hmod锻戒护

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