[root@localhost demo]# w
08:59:43 up 11 min, 1 user, load average: 0.00, 0.01, 0.01
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
root pts/0 192.168.0.105 08:48 7.00s 0.09s 0.01s w
[root@localhost demo]# who
root pts/0 2025-01-07 08:48 (192.168.0.105)
[root@localhost demo]# echo "my name is llall" | tr '[a-z]' '[A-Z]'
MY NAME IS LLALL
[root@localhost demo]# echo "my name is llall my age 2323" | tr -d '[a-z]'
2323
[root@localhost demo]# echo "my name is llall my age 2323" | tr -d 'a'
my nme is llll my ge 2323
[root@localhost demo]# echo "my name is llall my age 2323" | tr -d '0-9'
my name is llall my age
[root@localhost demo]# tr 'a' 'A' <alex.txt
my nAme is Alex.
he love linux.
he like eAt Apple.
[root@localhost demo]# cat alex.txt
my name is alex.
he love linux.
he like eat apple.
[root@localhost demo]# echo "my nameeeee issss hahahha" | tr -s 'esh'
my name is hahaha
标签：2323,demo,tr,命令,root,my,localhost From： https://www.cnblogs.com/wmqxlt/p/18656739