January 2021

Bash 字符索引

Posted on January 31, 2021 by Adin Linux


#!/bin/sh

index_char()
{
    # 参数需>=两个
    if [ $# -lt 2 ]; then
        echo 'Lack of Parameters'
        return
    fi

    # n: 待索引第n个字符
    declare -i n
    if [ $# -eq 2 ]; then
        n=1
    elif [ $# -eq 3 ]; then
        n=$3
    fi

    string=$1
    target=$2

    declare -i target_len=`expr length $target`
    if [ $target_len -gt 1 ]; then
        echo 'Not support to index string'
        return
    fi

    declare -i left=0
    declare -i index=0
    declare -i len=${#string}
    declare -i result=0

    for i in `seq $n`;
    do
        index=`expr index $string $target`
        left=$len-$index
        string=${string:$index:${left}}
        result=$result+$index

        if [ $index -eq 0 ]; then
            echo 'Out Of Range'
            break;
        fi

    done

    echo $result
}

index_char $@

#!/bin/sh

index_char()

{

# 参数需>=两个

if [ $# -lt 2 ]; then

echo 'Lack of Parameters'

return

# n: 待索引第n个字符

declare -i n

if [ $# -eq 2 ]; then

n=1

elif [ $# -eq 3 ]; then

n=$3

string=$1

target=$2

declare -i target_len=`expr length $target`

if [ $target_len -gt 1 ]; then

echo 'Not support to index string'

return

declare -i left=0

declare -i index=0

declare -i len=${#string}

declare -i result=0

for i in `seq $n`;

index=`expr index $string $target`

left=$len-$index

string=${string:$index:${left}}

result=$result+$index

if [ $index -eq 0 ]; then

echo 'Out Of Range'

break;

done

echo $result

}

index_char $@

计算两台主机之间请求发送到接收处理的时间差

Posted on January 30, 2021 by Adin Linux

一. 在服务器创建时间差计算脚本存于print_diff_time.sh


#!/bin/bash

while [ true ];
do
    read client_time
    declare -i now
    declare -i diff
    now=$(($(date +%s%N)/1000000))
    diff=now-$client_time
    echo 'diff time is: '$diff' us'
done

#!/bin/bash

while [ true ];

read client_time

declare -i now

declare -i diff

now=$(($(date +%s%N)/1000000))

diff=now-$client_time

echo 'diff time is: '$diff' us'

done

...

自定义内置命令

Posted on January 29, 2021 by Adin Linux

一. 添加脚本存于~/shell/mycd.sh


#!bin/bash

check_history_file_size()
{
    history_file=$1

    # 文件行数超过1000清空
    lines=`wc -l $history_file | awk '{print $1}'`
    if [ $lines -gt 1000 ]; then
        echo '' > $history_file
    fi
}

storage_current_dir()
{
    current_dir=`pwd -P`
    echo $current_dir >> $history_file
}

mycd()
{
    if [ $# -eq 0 ]; then
        cd ~
        return
    fi

    history_file="${HOME}/.previous_dir"
    touch $history_file

    # 如果第一个参数是以横杠开头
    if [ ${1:0:1} = '-' ]; then

        if [ ${1:1:1} = 'o' ]; then
            tail $history_file -n 10
            return
        fi

        len=${#1}
        target_dir=`tail -n $len $history_file | head -n 1`
        storage_current_dir
        cd $target_dir
        return
    fi

    check_history_file_size $history_file
    storage_current_dir
    cd $@
}

#!bin/bash

check_history_file_size()

{

history_file=$1

# 文件行数超过1000清空

lines=`wc -l $history_file | awk '{print $1}'`

if [ $lines -gt 1000 ]; then

echo '' > $history_file

}

storage_current_dir()

{

current_dir=`pwd -P`

echo $current_dir >> $history_file

}

mycd()

{

if [ $# -eq 0 ]; then

cd ~

return

history_file="${HOME}/.previous_dir"

touch $history_file

# 如果第一个参数是以横杠开头

if [ ${1:0:1} = '-' ]; then

if [ ${1:1:1} = 'o' ]; then

tail $history_file -n 10

return

len=${#1}

target_dir=`tail -n $len $history_file | head -n 1`

storage_current_dir

cd $target_dir

return

check_history_file_size $history_file

storage_current_dir

cd $@

}

...

January 2021

Bash 字符索引

计算两台主机之间请求发送到接收处理的时间差

自定义内置命令

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