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使用表创建自定义环境变量集

environment-variables bash

P i · 技术社区 · 5 年前

管道的不同部分需要不同的子集。

timestamp=01-02-03T04:05
version=1.2.3

table='
VAR_NAME   DJANGO_ENV   K8S_ENV
timestamp  â           â
version    â           âï¸
'

现在我想填充 DJANGO_ENV 和 K8S_ENV

DJANGO_ENV="timestamp=01-02-03T04:05 version=1.2.3"
K8S_ENV="timestamp=01-02-03T04:05"

... 这样我就可以跑了 $K8S_ENV create_k8s_infra

怎么做?

1 回复 | 直到 5 年前

P i 5 年前

timestamp=01-02-03T04:05
version=1.2.3

table='
VAR_NAME   DJANGO_ENV   K8S_ENV
timestamp  â           â
version    â           âï¸
'

{
    read -r # first line is blank
    read -r first_nonblank_line
    read -r -a env_names <<< "$first_nonblank_line"
    echo "Env-names: ${env_names[@]}"

    while read -r line; do 
        if [[ -n $line ]]; then
            echo
            echo "line=$line"

            read -r -a arr <<< "$line"

            nCols=${#arr[@]}

            var_name=${arr[0]}

            for (( i=1; i<${nCols}; i++ )); do
                echo "    Col#${i} "
                if [[ ${arr[i]} == "â" ]]; then
                    env_name=${env_names[i]}
                    echo "    Adding $var_name to $env_name"
                    printf -v "$env_name" '%s' "${!env_name} $var_name=\"${!var_name}\""
                fi
            done
        fi
    done
} <<< "$table"

echo "DJANGO_ENV: $DJANGO_ENV"
echo "K8S_ENV: $K8S_ENV"

输出:

> ./table.sh 
Env-names: VAR_NAME DJANGO_ENV K8S_ENV

line=timestamp  â           â
    Col#1 
    Adding timestamp to DJANGO_ENV
    Col#2 
    Adding timestamp to K8S_ENV

line=version    â           âï¸
    Col#1 
    Adding version to DJANGO_ENV
    Col#2 
DJANGO_ENV:  timestamp=01-02-03T04:05 version=1.2.3
K8S_ENV:  timestamp=01-02-03T04:05

Himanshu Tanwar 5 年前

试用评估:

eval $K8S_ENV create_k8s_infra

eval $K8S_ENV
create_k8_infra

(可能第一次没有工作的原因: here

也可以直接使用printf来填充变量,而不是使用printf:

timestamp=01-02-03T04:05
version=1.2.3

table='
VAR_NAME   DJANGO_ENV   K8S_ENV
timestamp  â           â
version    â           âï¸
'

{
    read -r # first line is blank
    read -r first_nonblank_line
    read -r -a env_names <<< "$first_nonblank_line"
    echo "Env-names: ${env_names[@]}"

    while read -r line; do 
        if [[ -n $line ]]; then
            echo
            echo "line=$line"

            read -r -a arr <<< "$line"

            nCols=${#arr[@]}

            var_name=${arr[0]}

            for (( i=1; i<${nCols}; i++ )); do
                echo "    Col#${i} "
                if [[ ${arr[i]} == "â" ]]; then
                    echo "    Adding $var_name to ${env_names[i]}"
                    eval ${env_names[i]}=\"\${${env_names[i]}} $var_name=\"${!var_name}\"\"
                fi
            done
        fi
    done
} <<< "$table"

echo "DJANGO_ENV: $DJANGO_ENV"
echo "K8S_ENV: $K8S_ENV"