REMOVE BLANK SPACE IN A FILE IN LINUX
If you want to remove blank space in a file , you can use these commands to make them invisible. In bash shell , blank space is denoted with the caret with dollar symbol ‘^$’
Use sed command to remove only blank space using ‘d’ option
Use grep with ‘^$’ option
Commands used
[oracle@orcl19x ~]$ cat dbsize
INP_BYTE OUT_BYTE OBJECT_TYPE PCTDONE TOTALDATA IO_THROUGHPUT
---------- ---------- ------------- ---------- ---------- -------------
0 0 0 5364 13
671.992188 671.992188 DB FULL 12.5278186 5364 13.9266707
[oracle@orcl19x ~]$ sed '/^$/d' dbsize
INP_BYTE OUT_BYTE OBJECT_TYPE PCTDONE TOTALDATA IO_THROUGHPUT
---------- ---------- ------------- ---------- ---------- -------------
0 0 0 5364 13
671.992188 671.992188 DB FULL 12.5278186 5364 13.9266707
[oracle@orcl19x ~]$ cat dbsize|grep -v '^$'
INP_BYTE OUT_BYTE OBJECT_TYPE PCTDONE TOTALDATA IO_THROUGHPUT
---------- ---------- ------------- ---------- ---------- -------------
0 0 0 5364 13
671.992188 671.992188 DB FULL 12.5278186 5364 13.9266707