Linux命令行特殊字符MBM字符处理？

　　# 场景描述
　　遇到同事执行命令始终抱错,以为是role问题,因为Google的这个warning太弱智了
　　如下
　　`gcloud iam service-accounts add-iam-policy-binding --role roles/iam.workloadIdentityUser --member ＂serviceAccount:English-dev.svc.id.goog[namespace/English-dev-sql-sa]＂ cloudsql-user@chinaunux-dev.iam.gserviceaccount.com --project chinaunux-dev`
　　报错如下:
　　ERROR: Policy modification failed. For a binding with condition, run ＂gcloud alpha iam policies lint-condition＂ to identify issues in condition.
　　ERROR: (gcloud.iam.service-accounts.add-iam-policy-binding) INVALID_ARGUMENT: The role name must be in the form ＂roles/{role}＂, ＂organizations/{organization_id}/roles/{role}＂, or ＂projects/{project_id}/roles/{role}＂.
　　M-BM字符是字节序列0xc2 0xa0的ASCII表示，它是unicode字符A0的UTF8编码，是一个非中断空格字符。使用键序列strl+shift+space，可以在LibreOffice和Microsoft Word文档中插入此字符
　　根本原因是特殊字符的原因
　　所以分析看下:
　　排除特殊字符的时候cat是个好工具,先看下用法
　　```bash
　　cat --help
　　-A, --show-all equivalent to -vET
　　-v, --show-nonprinting use ^ and M- notation, except for LFD and TAB
　　```
　　$ file a.sh
　　a.sh: Unicode text, UTF-8 text
　　$ file -bi a.sh
　　text/plain; charset=utf-8
　　$ cp a.sh b.sh
　　$ vi b.sh 手动编辑去掉特殊字符
　　$ cat -v b.sh
　　gcloud iam service-accounts add-iam-policy-binding --role roles/iam.workloadIdentityUser --member ＂serviceAccount:English-dev.svc.id.goog[namespace/English-dev-sql-sa]＂ cloudsql-user@chinaunux-dev.iam.gserviceaccount.com --project chinaunux-dev
　　$ file -bi b.sh
　　text/plain; charset=us-ascii
　　# 给一些自动替换的办法
　　$ cp a.sh c.sh
　　$ sed -i ＂s/ / /g＂ c.sh
　　$ file -bi c.sh
　　text/plain; charset=us-ascii
　　# 搜索下
　　https://askubuntu.com/questions/357248/how-to-remove-special-m-bm-character-with-sed#!/bin/bash ############################################################################# # SCRIPT:   M-BM-Remover.sh # DESCRIPTION: #           This script will be able to detect hidden caracter ＂M-BM-＂, #               And/Or remove this ! # REVISIONS: #           2014/06/11  YG #____________________________________________________________________________ # # PARAMETERS: #  > $1  :TARGET,      (e.g. ＂＂*.sh＂＂ ) #  > $2  :ACTION,      (e.g. ＂remove＂ ) #  > $2  :BACKUP,      (e.g. ＂＂ ) # #############################################################################  TARGET=$1 ACTION=$2 BACKUP=$3  if [ ＂$TARGET＂ = ＂＂ ] then     echo ＂Need to choose target file＂     echo ＂M-BM-Remover [TARGET] [show/remove] [backup]＂     echo ＂Example : M-BM-Remover ＂*.sh＂ remove backup＂     exit fi  echo ＂ACTION = $ACTION＂; echo ＂TARGET = $TARGET＂; echo  if [ ＂$ACTION＂ = ＂show＂ ] then     for file in $TARGET     do         if [ ＂$file＂ != ＂M-BM-Remover.sh＂ ]         then             echo ＂Traitement de $file ...＂             cat -v $file | grep M-BM-             NB=`cat -v $file | grep M-BM- | wc -l`             echo ＂Occurence(s) : $NB＂         fi     done  fi  if [ ＂$ACTION＂ = ＂remove＂ ] || [ ＂$ACTION＂ = ＂＂ ] then     for file in $TARGET     do         if [ ＂$file＂ != ＂M-BM-Remover.sh＂ ]         then             echo ＂Traitement de $file ...＂             NB=`cat -v $file | grep M-BM- | wc -l`             if [ ＂$BACKUP＂ = ＂backup＂ ]             then                 cat $file > $file.bak             fi             cat -v $file.bak | sed s/M-BM-//g > $file             echo ＂Occurence(s) removed : $NB＂         fi         echo     done  fi