DB2 学习笔记 - AIView.com

Match multi-tab

replace all of 1 or more TAB with write space in file, it seems "+" doesn't work in sed cmd.

$ sed 's/[    ][    ]*/ /g' file

Unknown write space number

To get the trailer number 3 from a file like this:

cat test.dat

A.B.C.D.E.A.B.C.D.E
A.B.C.D.E.A.B.C.D.E
A.B.C.D.E.A.B.C.D.E
COUNT       3

The write spaces between COUNT and the number 3 are unknown.

Use:

tail -1 test.dat | cut -d' ' -f2- | tr -d ' '

tail -1 test.dat
COUNT       3

tail -1 test.dat | cut -d' ' -f2-
3

tail -1 test.dat | cut -d' ' -f2- | tr -d ' '
3