tr, непонятно

root@web:~# mysql -u root -p -e "SHOW DATABASES;"
Enter password:
+--------------------+
| Database           |
+--------------------+
| information_schema |
| TMPdagblog         |
| TMPdaglab          |
| TMPmir05           |
| TMPpalata          |
| TMPpredag          |
| aligadzhimagomed   |
| amir               |
| as                 |
| cloudmrg           |
| company            |
| dagproc            |
| dagrock_forum      |
| dagrock_main       |
| dagtourism         |
| dstu               |
| fpk                |
| golddagestan       |
| info               |
| kdm                |
| meet               |
| mir05ru            |
| moodle             |
| mprdag             |
| mrg_tureckij       |
| mysql              |
| new                |
| nfs                |
| ooprd              |
| palata             |
| performance_schema |
| phpmyadmin         |
| profcom            |
| rakhmedov          |
| rcei               |
| rjb                |
| test               |
| test1              |
| test10             |
| test2              |
| transp             |
| uprprezmrg         |
+--------------------+

root@web:~# mysql -u root -p -e "SHOW DATABASES;" | tr -d "|"
Enter password: 
Database
information_schema
TMPdagblog
TMPdaglab
TMPmir05
TMPpalata
TMPpredag
aligadzhimagomed
amir
as
cloudmrg
company
dagproc
dagrock_forum
dagrock_main
dagtourism
dstu
fpk
golddagestan
info
kdm
meet
mir05ru
moodle
mprdag
mrg_tureckij
mysql
new
nfs
ooprd
palata
performance_schema
phpmyadmin
profcom
rakhmedov
rcei
rjb
test
test1
test10
test2
transp
uprprezmrg

root@web:~# tr --version
tr (GNU coreutils) 8.13
Copyright (C) 2011 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by Jim Meyering.

mysql -u root -p -e "SHOW DATABASES;" | cat

man mysql

mysql -B -e 'show databases;'
Database
information_schema
test

~# mysql -u root -p -e "SHOW DATABASES;" | tr -d "|"
Enter password: 
Database
information_schema
mysql
performance_schema
phpmyadmin
test
zope
~# mysql -u root -p -e "SHOW DATABASES;"
Enter password: 
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| phpmyadmin         |
| test               |
| zope               |
+--------------------+

~# mysql -u root -p -e "SHOW DATABASES;" | cat
Enter password: 
Database
information_schema
mysql
performance_schema
phpmyadmin
test
zope

~# mysql -u root -p -t -e "SHOW DATABASES;" | tr -d "|"
Enter password: 
+--------------------+
 Database           
+--------------------+
 information_schema 
 mysql              
 performance_schema 
 phpmyadmin         
 test               
 zope               
+--------------------+

ls

ls | cat