在bash脚本中乘法字符串 [英] Multiplying strings in bash script

问题描述

我知道，如果我在python中执行print ("f" + 2 * "o")，则输出将为foo.

I know that if I do print ("f" + 2 * "o") in python the output will be foo.

但是我如何在bash脚本中做同样的事情?

But how do I do the same thing in a bash script?

推荐答案

您可以使用bash

You can use bash command substitution to be more portable across systems than to use a variant specific command.

$ myString=$(printf "%10s");echo ${myString// /m}           # echoes 'm' 10 times
mmmmmmmmmm

$ myString=$(printf "%10s");echo ${myString// /rep}         # echoes 'rep' 10 times
reprepreprepreprepreprepreprep

使用更有用的shell函数将其包装

Wrapping it up in a more usable shell-function

repeatChar() {
    local input="$1"
    local count="$2"
    printf -v myString "%s" "%${count}s"
    printf '%s\n' "${myString// /$input}"
}

$ repeatChar str 10
strstrstrstrstrstrstrstrstrstr

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