expr index "$a" ov # 将substring拆成一个个字符去查找，最先找到的直接输出
expr match $string substr # substr必须从头开始匹配，不然匹配不了
#!/bin/bash
echo "请选择："
echo "（1）、打印string长度"
echo "（2）、删除字符串中所有的Hadoop"
echo "（3）、替换第一个Hadoop为Mapreduce"
echo "（4）、替换全部Hadoop为Mapreduce"
read -p "请选择：" num # 获取用户输入
str="Bigdata process framework is Hadoop,Hadoop is an open source project"
if (($num==1))
then
expr length "$str"
elif (($num==2))
then
echo "${str//Hadoop/}"
elif (($num==3))
then
echo "${str/Hadoop/Mapreduce}"
else
echo "${str//Hadoop/Mapreduce}"
fi
for i in ${arr[@]}
do
echo $i
done
declare -A site # declare -A site=(["google"]="www.google.com" ["runoob"]="www.runoob.com" ["taobao"]="www.taobao.com")
site["google"]="www.google.com"
site["runoob"]="www.runoob.com"
site["taobao"]="www.taobao.com"
echo ${site["runoob"]}
BEGIN {
a["a"] = 100
a["b"] = 110
a["c"] = 10
# 按照数组的值排序
n = asort(a, b) # 将数组a按照值排序，返回排序后的数组b，n是数组的长度
for (i = 1; i <= n; i++) {
print i, b[i]
}
# 按照数组的索引排序
n = asorti(a, c) # 将数组a按照索引排序，返回排序后的数组c，n是数组的长度
for (i = 1; i <= n; i++) {
print i, c[i], a[c[i]]
}
}
####输出
1 10
2 100
3 110
1 a 100
2 b 110
3 c 10
# 数字二维数组
# 有一个文件内容为
1 2 3
4 5 6
7 8 9
# 用awk当做一个二维数组处理
awk 'BEGIN {FS=" "} # 设置字段分隔符为一个空格
{
# 读取每一行，把每个字段存入一个二维数组
for (i=1; i<=NF; i++) {
array[NR,i] = $i
}
}
END {
# 遍历每一行，计算每一行的和
for (j=1; j<=NR; j++) {
sum = 0
for (k=1; k<=NF; k++) {
sum += array[j,k]
}
# 输出每一行的和
print "The sum of row " j " is " sum
}
}' data.txt
# 输出结果
The sum of row 1 is 6
The sum of row 2 is 15
The sum of row 3 is 24
[GROUP_LIST]
WEB
DB
[WEB]
nginx
[DB]
mysql
#!/bin/bash
# Func:Get Process Status In process.cfg
# Define Variables
HOME_DIR="/root/shell_b/script"
FILE_NAME=process.cfg
# 获得所有的组
function get_all_group
{
G_LIST=$(sed -n '/\[GROUP_LIST\]/,/\[.*\]/p' $HOME_DIR/$FILE_NAME | grep -v ^$|grep -v "\[*\]")
echo "$G_LIST"
}
# 获得所有的进程
function get_all_process
{
for g in `get_all_group`
do
p_list=$(sed -n "/\[$g\]/,/\[.*\]/p" $HOME_DIR/$FILE_NAME | grep -v ^$|grep -v "\[*\]")
echo "$p_list"
done
}
# 根据进程名拿进程ID
function get_process_pid_by_name
{
if [ $# -ne 1 ];then
return 1
else
pids=`ps -ef | grep $1 | grep -v grep | grep -v $$ |awk '{print $2}'`
echo "$pids"
fi
}
# 根据pid拿进程信息
function get_process_info_by_pid
{
if [ `ps -ef | awk -v pid=$1 '$2==pid{print }' | wc -l` -eq 1 ];then
pro_staus="RUNNING"
else
pro_staus="STOPED"
fi
pro_cpu=`ps aux | awk -v pid=$1 '$2==pid{print $3}'`
pro_mem=`ps aux | awk -v pid=$1 '$2==pid{print $4}'`
pro_start_time=`ps -p $1 -o lstart | grep -v STARTED`
}
# 判断组是否在文件中
function is_group_in_config
{
for gn in `get_all_group`;do
if [ "$gn" == "$1" ];then
return
fi
done
echo "GroupName $1 is not in process.cfg"
return 1
}
# 拿组内所有进程
function get_all_precess_by_group
{
is_group_in_config $1
if [ $? -eq 0 ];then
p_list=$(sed -n "/\[$1\]/,/\[.*\]/p" $HOME_DIR/$FILE_NAME | grep -v ^$|grep -v "\[*\]")
echo $p_list
else
echo "Process $1 is not in process.cfg"
fi
}
# 根据进程名拿组
function get_group_by_process_name
{
for gn in `get_all_group`;do
for pn in `get_all_precess_by_group $gn`;do
if [ $pn == $1 ];then
echo "$gn"
fi
done
done
}
# 格式化输出信息
function format_print
{
ps -ef | grep $1 |grep -v grep |grep -v $$ &> /dev/null
if [ $? -eq 0 ];then
pids=`get_process_pid_by_name $1`
for pid in $pids;do
get_process_info_by_pid $pid
awk -v p_name=$1 \
-v g_name=$2 \
-v p_status=$pro_staus \
-v p_pid=$pid\
-v p_cpu=$pro_cpu \
-v p_mem=$pro_mem \
-v p_start_time="$pro_start_time" \
'BEGIN{printf "%-10s%-10s%-10s%-5s%-5s%-5s%-15s\n",p_name,g_name,p_status,p_pid,p_cpu,p_mem,p_start_time}'
done
else
awk -v p_name=$1 \
-v g_name=$2 \
'BEGIN{printf "%-10s%-10s%-10s%-5s%-5s%-5s%-15s\n",p_name,g_name,"NULL","NULL","NULL","NULL","NULL"}'
fi
}
# 判断进程是否在文件内
function is_process_in_config
{
for pn in `get_all_process`;do
if [ $pn == $1 ];then
return
fi
done
echo "Process $1 not in process.cfg"
return 1
}
awk 'BEGIN{printf "%-10s%-10s%-10s%-5s%-5s%-5s%-15s\n","pname","gname","status","pid","cpu","mem","start_time"}'
# 构建程序流程
if [ $# -gt 0 ];then
if [ "$1" == "-g" ];then
shift
for gn in $@;do
is_group_in_config $gn || continue
for pn in `get_all_precess_by_group $gn`;do
is_process_in_config $pn && format_print $pn $gn
done
done
else
for pn in $@;do
gn=`get_group_by_process_name $pn`
is_process_in_config $pn && format_print $pn $gn
done
fi
echo
else
for pn in `get_all_process`;do
gn=`get_group_by_process_name $pn`
is_process_in_config $pn && format_print $pn $gn
done
fi
# 判断文件是否存在
if [ ! -e $HOME_DIR/$FILE_NAME ];then
echo "$FILE_NAME is not exit..Please Check.."
exit 1
fi
[root@localhost script]# sh app_status.sh
pname gname status pid cpu mem start_time
nginx WEB RUNNING 1064 0.0 0.0 Wed Mar 15 14:32:47 2023
nginx WEB RUNNING 1065 0.0 2.7 Wed Mar 15 14:32:47 2023
nginx WEB RUNNING 1066 0.0 0.1 Wed Mar 15 14:32:47 2023
mysql DB RUNNING 1092 0.0 0.1 Wed Mar 15 14:32:48 2023
mysql DB RUNNING 1552 0.0 19.0 Wed Mar 15 14:32:52 2023
[root@localhost script]# sh app_status.sh nginx
pname gname status pid cpu mem start_time
nginx WEB RUNNING 1064 0.0 0.0 Wed Mar 15 14:32:47 2023
nginx WEB RUNNING 1065 0.0 2.7 Wed Mar 15 14:32:47 2023
nginx WEB RUNNING 1066 0.0 0.1 Wed Mar 15 14:32:47 2023
nginx WEB STOPED 13401
[root@localhost script]# sh app_status.sh -g WEB
pname gname status pid cpu mem start_time
nginx WEB RUNNING 1064 0.0 0.0 Wed Mar 15 14:32:47 2023
nginx WEB RUNNING 1065 0.0 2.7 Wed Mar 15 14:32:47 2023
nginx WEB RUNNING 1066 0.0 0.1 Wed Mar 15 14:32:47 2023
