小编Sha*_*oon的帖子

#!/bin/sh
echo "Noise $1"
echo "Enhancement $2"
for snr in 0 5 10 15 20 25
do
  python evaluate.py --noise $1 --snr 25 --iterations 1250 --enhancement $2
done

如果$2未指定，我不想将--enhancement $2参数传递给我的 python 脚本。我该怎么做？

我有一些目录：

drwxr-xr-x  10 shamoon  staff   320B Mar 20 10:05 dryrun-20200320_140542-1vbczul4
drwxr-xr-x  10 shamoon  staff   320B Mar 20 10:06 dryrun-20200320_140605-uze15jta
drwxr-xr-x  10 shamoon  staff   320B Mar 20 10:06 dryrun-20200320_140644-193bynci
drwxr-xr-x  13 shamoon  staff   416B Mar 20 10:07 dryrun-20200320_140721-fuv399ji
drwxr-xr-x  13 shamoon  staff   416B Mar 20 10:08 dryrun-20200320_140810-34dim70r
drwxr-xr-x  14 shamoon  staff   448B Mar 20 10:10 dryrun-20200320_140935-138yuidx
drwxr-xr-x  14 shamoon  staff   448B Mar 20 10:23 dryrun-20200320_141044-35pfvec6
drwxr-xr-x  14 shamoon  staff   448B Mar 20 11:14 dryrun-20200320_151418-14g88zfr
drwxr-xr-x  14 shamoon  staff   448B Mar 20 …