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--- bash:cat [2021/01/26 11:44] – [Enter data between 2 files] peter
+++ bash:cat [2021/01/26 15:55] (current) – removed peter
@@ Line 1: / Line 1: @@
-====== BASH - cat ======
-**cat** is used to concatenate or write files, text or binary.
-----
-===== Write a file =====
-<code bash>
-cat > list.txt
-</code>
-type into the terminal:
-<code bash>
-aaa
-bbb
-ccc
-</code>
-<WRAP info>
-Press **CTRL+D** to stop inputting and save file.
-  * This can only be done at the start of a new line; so **<ENTER>** needs to be done against the last line before being able to do a **CTRL-D**.
-This would have created the file **list.txt**.
-</WRAP>
-----
-===== Display a file =====
-<code bash>
-cat list.txt
-</code>
-returns:
-<code bash>
-aaa
-bbb
-ccc
-</code>
-----
-===== Concatenate multiple files =====
-Create another file, named list2.txt, containing:
-<code bash>
-ddd
-eee
-</code>
-----
-==== Do the concatenation ====
-<code bash>
-cat list.txt list2.txt
-</code>
-returns:
-<code bash>
-aaa
-bbb
-ccc
-ddd
-eee
-</code>
-----
-=== Concatenate to a new file ===
-<code bash>
-cat list.txt list2.txt > list3.txt
-</code>
-----
-=== Display this new file ===
-<code bash>
-cat list3.txt
-</code>
-returns:
-<code bash>
-aaa
-bbb
-ccc
-ddd
-eee
-</code>
-----
-===== Append to a file =====
-<code bash>
-cat >> list3.txt
-</code>
-enter:
-<code>
-fff
-ggg
-</code>
-<WRAP info>
-Press **CTRL+D** to stop inputting and save file.
-</WRAP>
-----
-=== Display the appended file ===
-<code bash>
-cat list3.txt
-</code>
-returns:
-<code bash>
-aaa
-bbb
-ccc
-ddd
-eee
-fff
-ggg
-</code>
-----
-===== Enter data between 2 files =====
-<code bash>
-cat list.txt - list2.txt > list4.txt
-</code>
-enter:
-<code bash>
-hhh
-</code>
-<WRAP info>
-Press **CTRL+D** to stop inputting and save file.
-</WRAP>
-----
-=== Display the file ===
-<code bash>
-cat list4.txt
-</code>
-returns:
-<code bash>
-aaa
-bbb
-ccc
-hhh
-ddd
-eee
-</code>
-<WRAP info>
-**NOTE:**  The **hhh** data is showing in the middle of the data from the 2 input files.
-</WRAP>
-----
-==== Join split binary files ====
-<code bash>
-cat video.001 video.002 video.003 > vid.avi
-</code>