Differences between version 55 and predecessor to the previous major change of BashNotes.
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| Newer page: | version 55 | Last edited on Saturday, April 21, 2007 8:43:06 am | by BenStaz | Revert |
| Older page: | version 52 | Last edited on Friday, March 16, 2007 8:16:47 pm | by LawrenceDoliveiro | Revert |
@@ -372,8 +372,11 @@
!How can I see what my command will look like after bash expands it?
After typing the command, press ''Esc'' then press ''C-e''
+!Bash C-style for loop construct
+
+for ((i=1; i<100;i++));do echo $i; done;
!How can I do Division in bash using floating point numbers?
Use ''bc''
@@ -395,12 +398,34 @@
if [ $bla -eq 1 -o $cars -eq 3 -o $monkeys -eq 4 ]; then
echo "Westside"
fi
</verbatim>
+
+!How can I supply filenames with a prefix of '-' '--' as arguments to a program?
+
+Say you have a file called '--test'.
+If you wanted to use vim to edit this file then you would do:
+
+*vim -- --test
+
+The '--' tells the command that what follows is an argument, NOT to interpret them as options.
+
+!How to directly interpret a shell script by the current shell. (Without forking a subshell)
+
+*. <myscript>
+
+If the above script makes a change to the environment, it is the environment of this shell that is changed.
+So if inside the script we change the directory, then when the script has finished being interpreted we will find ourselves in the new directory.
+
+Note : This can be handy when you want to reset the shell environment variables.
+
+Just do:
+
+*. ~~/.bashrc
!! See also
* CommonErrors, under "Your shell hangs"
* BashOneLiners
* SpacesInPathNames
* PortabilityNotes
* [bash reference manual|http://www.gnu.org/software/bash/manual/bashref.html]
