WILDMASKS
Can use wildmasks for matching patterns in filenames; expand into a list of all filename matches. E.g.:       * matches any string       ? matches any one character       [abgj] matches any one character in this range/list $ ls   sub1_t1.nii.gz sub1_t2.nii.gz sub2_t1.nii.gz sub2_t2.nii.gz sub3_pd.nii.gz $ ls sub*   sub1_t1.nii.gz sub1_t2.nii.gz sub2_t1.nii.gz sub2_t2.nii.gz sub3_pd.nii.gz $ ls sub1*   sub1_t1.nii.gz sub1_t2.nii.gz $ ls sub*t1*   sub1_t1.nii.gz sub2_t1.nii.gz $ ls sub[13]*   sub1_t1.nii.gz sub1_t2.nii.gz sub3_pd.nii.gz $ ls sub?_t2.nii.gz   sub1_t2.nii.gz sub2_t2.nii.gz