echo不换行输出实现进度条

#!/bin/bashCPIO_FILE_XZ="ROOTFS.cpio.xz"progress(){    while true;    do        echo -e "=\c"  #echo的参数中, -e表示开启转义, /c表示不换行        sleep 1    done}find * -depth -print | cpio -H newc -o > ../ROOTFS.cpiocd ..if [ -f $CPIO_FILE_XZ ]; then    echo "ROOTFS.cpio.xz already exist in `pwd`, remove it before generate .cpio.xz!!!"    rm $CPIO_FILE_XZfiprogress &pidback=$!xz -z ROOTFS.cpioif mkfep -k ROOTFS.cpio.xz  ROOTFS.FEP ; then    echo 'FEP generated!!'    echo "`pwd`/ROOTFS.FEP"fikill -9 $pidbackexit $?

输出：

[root@linux1 temp]# mkfep.sh    
265523 blocks
ROOTFS.cpio.xz already exist in /home/xiatian/, remove it before generate .cpio.xz!!!
=======================================================================FEP generated!!
/home/xiatian/ROOTFS.FEP