We often test the understanding of the command line scan by asking if the following will work:
$ > /tmp/file1 2> /tmp/file2 (*)
This week, been faced with questions exploring this further. For example, notice that:
$ >log ( ps; who; df )
will work, so will
$ > log10 < /etc/hosts (while read -r line; do print $line; done )
(*) It will (as long as file exists). The shell opens all three files during the scan, and cat will be the only word remaining on the command line. In simple terms. the shell will look after the 'connectivity' between cat's I/O streams and the files.
Mostly Unix and Linux topics. But flying might get a mention too.
Subscribe to:
Post Comments (Atom)
Blog Archive
- June (1)
- April (2)
- February (3)
- June (1)
- March (1)
- August (3)
- July (2)
- June (1)
- March (1)
- June (3)
- May (1)
- April (5)
- February (1)
- January (5)
- October (1)
- September (3)
- July (4)
- June (5)
- April (3)
- March (1)
- February (3)
- January (3)
- October (7)
- August (2)
- July (3)
- May (1)
- November (4)
- October (1)
- September (1)
- August (2)
- July (2)
- June (3)
- May (3)
- April (2)
- March (2)
- February (3)
- January (1)
- December (2)
- November (1)
- October (6)
- September (6)
- August (1)
- July (2)
- June (8)
- May (3)
- April (4)
- March (3)

2 comments:
Enjoyable blog. Pleasse vidit my free linux software blog.
Hello, your blog is informative. I have a linux server related website, please visit and hope that it is helpful to you
Post a Comment