1 篇文章带有标签 “tr”

$ df -h
Filesystem      Size  Used Avail Use% Mounted on
udev            126G     0  126G   0% /dev
tmpfs            26G  4.0M   26G   1% /run
/dev/sda2       548G   50G  471G  10% /
tmpfs           126G     0  126G   0% /sys/fs/cgroup
/dev/sda1       511M  7.9M  504M   2% /boot/efi
/dev/sdb1       2.0T  4.7G  1.9T   1% /data

字母小写转大写

$ df -h | tr [:lower:] [:upper:]

FILESYSTEM      SIZE  USED AVAIL USE% MOUNTED ON
UDEV            126G     0  126G   0% /DEV
TMPFS            26G  4.0M   26G   1% /RUN
/DEV/SDA2       548G   50G  471G  10% /
TMPFS           126G     0  126G   0% /SYS/FS/CGROUP
/DEV/SDA1       511M  7.9M  504M   2% /BOOT/EFI
/DEV/SDB1       2.0T  4.7G  1.9T   1% /DATA

$ df -h | tr a-z A-Z

字母大写转小写

$ df -h | tr [:upper:] [:lower:]
$ df -h | tr A-Z a-z