shell数组、文件列表处理和后几行删除汇总

shell 数组的几种形式汇总：

1.

HOSTS=()
while read line
do
HOSTS[${#HOSTS[@]}]=$line
done < $hostfile

 

2.

for i in "${A[@]}"; do

    echo $i

done

3.

INFOS="
A,
B,
C,
D
"
for INFO in $INFOS
do

     AREA=`echo $INFO | awk -F ',' '{print $1}'`

     echo $AREA

done

4.#!/bin/bash

ary="hyves nk us it tr ae"

for i in $ary;

do

  echo $i

done

5.#!/bin/bash

      ary=("hyves" "nk" "us" "it" "tr" "ae")

      for i in ${ary[@]};

        do

          echo $i

        done

6.

 

#!/bin/bash

 

arr=("hyves" "nk" "us" "it" "tr" "ae")

 

len=${#arr[@]}

 

for((i=0;i<len;++i))

do

    echo ${arr[$i]}

done

#

7.Foo=("a" "b" "c" "d" "e")

 

for name in ${Foo[@]}

do

  echo $name

done

 

for (( i = 0 ; i < ${#Foo[@]} ; i++ ))

do

  echo ${Foo[$i]}

done

 

8.判断：

#

      ary=(hyves,nk,us,it,tr,ae)

      if [[ "${ary[@]}" =~ $AREA ]]; then

             CODE_PATH=/mnt/htdocs/farm/

             echo "$CODE_PATH"

      else

             echo "OK"

       fi

#

============================================

`cat hostfile |tr '\n' ','`  文件列表合并一行

[root@server ~]# A=$(sed -n '$=' a.txt)
[root@server ~]# sed $(($A-3+1)),${A}d a.txt

或者使用上面两条命令。删除的是倒数3行的。
如果删除倒数300 ，那就把3改为300 就可以了。

 

 

pdsh 

http://www.grid5000.fr/mediawiki/index.php/PDSH

time pdsh -R ssh -l root  -w `cat host-testweb.txt|tr '\n' ','` "w|grep load ;hostname "

pssh

time pssh -h hostfile    -P "w|grep load ;hostname "