Question

这是一个非常常见的脚本：

#!/bin/bash

teststr="col1 col2"

var1=`echo ${teststr} | awk '{print $1}'`
var2=`echo ${teststr} | awk '{print $2}'`

echo var1=${var1}
echo var2=${var2}

但是我不喜欢这个，特别是当有更多的字段需要解析时。我想应该有更好的方式：

（var1，var2）=`echo $ {teststr} | awk'{print $ 1 $ 2}' （在我的想象中）

是吗？是这样吗？感谢您帮助提高效率并节省一些CPU电量。

Answer 1

这可能对您有用：

var=(col0 col1 col2)
echo "${var[1]}"
col1

Answer 2

Bash有阵列支持，我们只需要动态提供值：）

function test_set_array_from_awk(){

    # Note : -a is required as declaring array
    let -a myArr;

    # Hard Coded Valeus 
    # myArr=( "Foo" "Bar" "other" );
    # echo "${myArr[1]}" # Print Bar 

    # Dynamic values 
    myArr=( $(echo "" | awk '{print "Foo"; print "Bar"; print "Fooo-And-Bar"; }') );

    # Value @index 0 
    echo "${myArr[0]}" # Print Foo

    # Value @index 1
    echo "${myArr[1]}" # Print Bar 

    # Array Length 
    echo ${#myArr[@]}  # Print 3 as array length 

    # Safe Reading with Default value 
    echo "${myArr[10]-"Some-Default-Value"}" # Print Some-Default-Value
    echo "${myArr[10]-0}"    # Print 0  
    echo "${myArr[10]-''}"   # Print ''
    echo "${myArr[10]-}"     # Print nothing

    # With Dynamic Index 
    local n=2
    echo "${myArr["${n}"]-}" # Print Fooo-And-Bar

}

# calling test function
test_set_array_from_awk

Bash阵列文档：http://tldp.org/LDP/abs/html/arrays.html

Answer 3

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$2

从一个awk命令设置多个变量？

3 个答案: