sed 命令在脚本上不起作用，但在终端上作为一个命令它工作正常

Question

我试图弄清楚为什么 sed 的命令确实在命令行上作为一个命令工作，例如如果运行 sed -i '4d;7d;8d;20d;21d;22d;26d;27d;31d' "$mydir ".spec ， $mydir 之前创建的当然是作为变量使用，但在脚本中它不起作用......我做错了什么？ 任何帮助我都会非常感激

#!/usr/bin/env bash
# Created by 
# Date:05.02.2022
# Version:0.0.20
# Objective : automation script for creating rpm package
#set -x
function usage
{
echo "in order to use this script you need to add the filename which"
echo "contain the script. for example:"
echo "makerpm.sh -s [scriptname].sh"

}

function check {

# check if package exists , if not install it.
chk1=$(rpm -qa | grep -e rpmdev -e rpm-build)
if [[  -z ${chk1} ]];then 
   echo "package doesn't exist, installing packages" 
   sleep 5 
   sudo yum install wget -y
   wget http://mirror.centos.org/centos/7/os/x86_64/Packages/rpmdevtools-8.3-5.el7.noarch.rpm
   sudo yum install rpmdevtools-8.3-5.el7.noarch.rpm -y
   rpmcreate
else
   echo "package exists .."
   sleep 5
   rpmcreate
fi
}


function rpmcreate
{
# creating rpmtree
cd $HOME
rpmdev-setuptree
starti
}



# creating script file
function starti {
cd ~/shell-utilities/00_build_pkg
# move the script to SOURCE
mydir=$(echo "$myarg" | awk -F'.' '{print $1}') 
mkdir "$mydir"-0.0.1
mv "$mydir".sh "$mydir"-0.0.1
tar --create --file "$mydir"-0.0.1.tar.gz "$mydir"-0.0.1
mv "$mydir"-0.0.1.tar.gz ~/rpmbuild/SOURCES

# create a spec file
rpmdev-newspec "$mydir"

# move the file to SPECS Folder

mv ./"$mydir".spec ~/rpmbuild/SPECS

cd ~/rpmbuild/SPECS

sed -i '4d;7d;8d;20d;21d;22d;26d;27d;31d' "$mydir".spec
sed 's/Version/& 0.0.1/' "$mydir".spec 
sed '/Summary:/a Sample Script' "$mydir".spec
sed '/License:/a GPL' "$mydir".spec
sed '/Source0:/a %{name}-%{version}.tar.gz' "$mydir".spec
sed '/BuildRequires:/BuildArch:noarch/' "$mydir".spec
sed '/Requires:/a bash' "$mydir".spec
sed '/%description/\n/a sample' "$mydir".spec
sed '/%files/\n/a /tmp/%{name}.sh' "$mydir".spec

# checking the spec file on error 
check=$(rpmlint ~/rpmbuild/SPECS/"$mydir.spec" | awk '/checked/ {print $7}')
if [ "$check" = "0" ];then
   echo "you did a good work lad!"
else
   echo "$check"
   echo "problem with your SPECS file fix it F.I.A.T !!! (Fix it again $USER)"
fi

rpmbuild -bs ~/rpmbuild/SPECS/"$mydir".spec
}


while getopts s:h arg; do 

  case "$arg" in 
   h)
    usage 
    ;;
   s)myarg=${OPTARG}
    check
    ;;
   :)usage
    ;;
   \?)usage
    ;;
  esac
done