cat /etc/issue
tr 'a-z' 'A-Z' < /etc/issue > /tmp/issue.out
cat /tmp/issue.out
cat /etc/issue | tr '[:lower:]' '[:upper:]' > /tmp/issue.out
cat /tmp/issue.out
cat /etc/issue
tr 'a-z' 'A-Z' < /etc/issue > /tmp/issue.out
cat /tmp/issue.out
cat /etc/issue | tr '[:lower:]' '[:upper:]' > /tmp/issue.out
cat /tmp/issue.out
/etc/issue和/etc/motd
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