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--- bash_notes [2022/04/22 16:44] – [list files within a specific range] raju
+++ bash_notes [2023/12/28 08:49] (current) – [other pages in this wiki] raju
@@ Line 4: / Line 4: @@
 ===== dummy =====
+==== other pages in this wiki ====
+  * [[bash scripting]]
+  * [[shell scripting notes]]
 ==== useful links ====
-  * https://mywiki.wooledge.org/ArithmeticExpression - Arithmetic Expansion
+  * https://explainshell.com/ - useful for understanding complex shell commands
+  * https://mywiki.wooledge.org/ArithmeticExpression - Arithmetic Expansion
+  * https://misc.flogisoft.com/bash/tip_colors_and_formatting - escape characters, color prompts, echo colored strings
+  * http://ezprompt.net/ - Easy bash prompt generator
+==== documentation links ====
+  * ignoredups, erasedups - https://www.gnu.org/software/bash/manual/html_node/Bash-Variables.html search for ignoredups .
+==== what is the difference between "ls > dirlist 2>&1" and "ls 2>&1 > dirlist"? ====
+The command
+<code>
+ls > dirlist 2>&1
+</code>
+directs both standard output (file descriptor 1) and standard error (file descriptor 2) to the file dirlist, while the command
+<code>
+ls 2>&1 > dirlist
+</code>
+directs only the standard output to file dirlist, because the standard error was made a copy of the standard output before the standard output was redirected to dirlist.
+To conclude, the order of redirections is significant.
+Ref:- https://www.gnu.org/software/bash/manual/html_node/Redirections.html -> 5th paragraph.
 ===== getopts =====
 ==== useful articles ====