Linux 如何将主机文件作为用户的输入并将其调用到脚本中

发布于05月22日

我正在使用下面的脚本ping多个Linux主机，如果它通过硬编码将hostfile个主机放入脚本本身，那么效果会非常好，但我希望这是基于用户输入的.

虽然我使用read该文件作为用户的输入，但这越来越失败，请建议我这里做错了什么.

#!/bin/bash
read -rsp $'Please Enter your hostFile name: ' target_File
echo $target_File
printf "$(date) Starting the Ping Check...."
function pingHost () {
    target_host=${1}
    ping -c2 ${target_host} >/dev/null 2>&1 &&
    printf "%-20s %-10s\n" "host ${target_host}" "ping SUCCESS" ||
    printf "%-20s %-10s\n" "host ${target_host}" "ping FAILED"
}
#
# Variable "data" seeks the filename containing host list.
data="$(< target_File)"
for line in $data
do
    pingHost ${line} &
done
wait
printf "Completed @=> $(date)"
printf "\n"

While giving the 100 inside the script then it works as follows ..

data="$(< hostfile)" <-- this hard-coded file containing hosts

$ ./ping_parallel.bash
Sun May 22 10:55:24 IST 2022 Starting the Ping Check....

host savfav0194         ping SUCCESS
host savfav0268         ping SUCCESS
host savfav0263         ping SUCCESS
host savfav0196         ping SUCCESS
host savfav0260         ping SUCCESS
host savfav0259         ping SUCCESS
host savfav2088         ping SUCCESS
host savfav2135         ping SUCCESS
host savfav2136         ping SUCCESS
host savfav3088         ping SUCCESS
host savfav0257         ping SUCCESS
host savfav0262         ping SUCCESS
host savfav0261         ping SUCCESS
host savfav0270         ping SUCCESS
host savfav0255         ping SUCCESS
host savfav0265         ping SUCCESS
host savfav0266          ping FAILED

Completed @=> Sun May 22 10:55:26 IST 2022

Failing while trying user input :

Please Enter your hostFile name: target_File
Sun May 22 10:58:54 IST 2022 Starting the Ping Check...../ping_parallel.bash: line 22: target_File: No such file or directory
Completed @=> Sun May 22 10:58:54 IST 2022

#!/bin/bash read -p $'Please Enter your hostFile name: ' target_File printf "$(date) Starting the Ping Check...." function pingHost () { target_host=${1} ping -c2 ${target_host} >/dev/null 2>&1 && printf "%-20s %-10s\n" "host ${target_host}" "ping SUCCESS" || printf "%-20s %-10s\n" "host ${target_host}" "ping FAILED" } while read -r line; do pingHost $line & done < $target_File wait printf "Completed @=> $(date)" printf "\n"

对脚本进行轻微修改:

#!/bin/bash read -rp $'Please Enter your hostFile name: ' target_File # Don't use variables in the printf format string. Use printf '..%s..' "$(date)". printf "Starting the Ping Check %s ....\n" "$(date)" # You Can Just use function name hence its your choice, i just removed. # pingHost i changed to "icmp_echo" as i used that # function pingHost () { icmp_echo () { target_host=${1} ping -c2 "${target_host}" >/dev/null 2>&1 && printf "%-32s %-10s\n" "host ${target_host}" "ping SUCCESS" || printf "%-32s %-10s\n" "host ${target_host}" "ping FAILED" } # Use a while loop and the read command. Where The -r option to read prevents backslash interpretation.By default,read modifies each line read, # by removing all leading and trailing whitespace characters (spaces and tabs, if present in IFS).If that is not desired, the IFS variable may # be cleared while IFS= read -r line do icmp_echo "$line" & # Double quote to prevent globbing and word splitting. done < "$target_File" wait # Don't use variables in the printf format string. Use printf '..%s..' "$(date)". printf "Completed @=> %s" "$(date)" printf "\n"

Linux 如何将主机文件作为用户的输入并将其调用到脚本中

推荐答案

对脚本进行轻微修改:

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