12-11-2010
It's all abstract. What makes moving back more abstract than moving forward, down, or to the beginning of the line?
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1. UNIX for Dummies Questions & Answers
Hi,
when I make a mistake and then try to backspace I am unable to do so . Can someone please suggest How I can correct this on my session
For Eg:
pwd^H^H^H
Thanks
rooh (2 Replies)
Discussion started by: rooh
2 Replies
2. UNIX for Dummies Questions & Answers
My AIX has Korn Shell. I had set the prompt by providing assigning to PS1. If on the prompt I use backspace it erase the whatever appeared due to PS1. Can someone tell me how to forbid this erasing of prompt string, with this behaviour?
Thanks in advance. (4 Replies)
Discussion started by: videsh77
4 Replies
3. UNIX for Dummies Questions & Answers
Hello, I am a UNIX newbie. With that out of that way..
In order to delete a mistyped character, I need to press control+h to move the cursor to the left, and then overwrite it. If I try hitting the backspace key, it just brings me to a new prompt.
Is there a way to change it so that my... (1 Reply)
Discussion started by: martinp973
1 Replies
4. Shell Programming and Scripting
Hello All,
What would be the equivalent of backspace key in the korn shell.
My scenario is: I am trying to install a product..and it comes out with a Licence Agreement screen, When I manually enter backspace key..I am able to get out of the whole agreement message to a point to type Agree A) or... (2 Replies)
Discussion started by: solaix14
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5. Solaris
Hi
In solaris if i have to delete something from shell i need to use ctrl+H, coz if i use backspace it shows ^?. Can any one please tell me how to set backspace key so that i can delete any character directly instead of using Ctrl+h.
Second Q is like in linux for going to recent command, i... (10 Replies)
Discussion started by: sarbjit
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6. UNIX for Dummies Questions & Answers
Hi all,
I am using a script which is as follows: It reads a character.
I want to check if the character is a backspace character or some other character.
read -n 1 x
if ; then
echo "backspace detected"
else
echo "some other character"
fi
Thanks in advance. (1 Reply)
Discussion started by: anandkumar
1 Replies
7. UNIX Desktop Questions & Answers
Hi gurus, i use vi editor. when I want search something I Type / (or ? if i want search backward), that is OK.
But when i make mistake in searching string how can i delete character ?
I tried bacskpase but did not work (gives just strange characters).
Also tried shift+bacskspace but this only... (3 Replies)
Discussion started by: wakatana
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8. Solaris
Hi friends,
Hope u r doing well. It is a very strange problem that I've never faced when I used linux or freebsd. When a type a command in Solaris 10, and if I make a mistake, the backspace doesn't work, when I press the backspace key three times forexample, this is what I get, ^H ^H ^H. The same... (2 Replies)
Discussion started by: gabam
2 Replies
9. Shell Programming and Scripting
i have something like this
tablesName="abc def hij akn ... etc etc"
count=0
for i in $tablesName
do
echo -en "\b\b\b\b\b\b\b\b\b\b\b\b\bTableCount: $count"
count=`expr $count + 1`
done
the above is just a description wha i need is when the loop executes
the... (1 Reply)
Discussion started by: vivek d r
1 Replies
10. Shell Programming and Scripting
Trying to insert a backspace for echo.
while true ; do
i='-\|/'
for j in 1 2 3 4
do
echo -ne "$(echo ${i} | cut -c${j})"
sleep 1
done
done
this currently outputs:
-\|/-\|/-\|/-\| .....etc
---------- Post updated at 02:34 PM ---------- Previous update was at 02:10 PM... (7 Replies)
Discussion started by: squrcles
7 Replies
LEARN ABOUT LINUX
erl_parse
erl_parse(3erl) Erlang Module Definition erl_parse(3erl)
NAME
erl_parse - The Erlang Parser
DESCRIPTION
This module is the basic Erlang parser which converts tokens into the abstract form of either forms (i.e., top-level constructs), expres-
sions, or terms. The Abstract Format is described in the ERTS User's Guide. Note that a token list must end with the dot token in order to
be acceptable to the parse functions (see erl_scan(3erl) ).
EXPORTS
parse_form(Tokens) -> {ok, AbsForm} | {error, ErrorInfo}
Types Tokens = [Token]
Token = {Tag,Line} | {Tag,Line,term()}
Tag = atom()
AbsForm = term()
ErrorInfo = see section Error Information below.
This function parses Tokens as if it were a form. It returns:
{ok, AbsForm} :
The parsing was successful. AbsForm is the abstract form of the parsed form.
{error, ErrorInfo} :
An error occurred.
parse_exprs(Tokens) -> {ok, Expr_list} | {error, ErrorInfo}
Types Tokens = [Token]
Token = {Tag,Line} | {Tag,Line,term()}
Tag = atom()
Expr_list = [AbsExpr]
AbsExpr = term()
ErrorInfo = see section Error Information below.
This function parses Tokens as if it were a list of expressions. It returns:
{ok, Expr_list} :
The parsing was successful. Expr_list is a list of the abstract forms of the parsed expressions.
{error, ErrorInfo} :
An error occurred.
parse_term(Tokens) -> {ok, Term} | {error, ErrorInfo}
Types Tokens = [Token]
Token = {Tag,Line} | {Tag,Line,term()}
Tag = atom()
Term = term()
ErrorInfo = see section Error Information below.
This function parses Tokens as if it were a term. It returns:
{ok, Term} :
The parsing was successful. Term is the Erlang term corresponding to the token list.
{error, ErrorInfo} :
An error occurred.
format_error(ErrorDescriptor) -> Chars
Types ErrorDescriptor = errordesc()
Chars = [char() | Chars]
Uses an ErrorDescriptor and returns a string which describes the error. This function is usually called implicitly when an ErrorInfo
structure is processed (see below).
tokens(AbsTerm) -> Tokens
tokens(AbsTerm, MoreTokens) -> Tokens
Types Tokens = MoreTokens = [Token]
Token = {Tag,Line} | {Tag,Line,term()}
Tag = atom()
AbsTerm = term()
ErrorInfo = see section Error Information below.
This function generates a list of tokens representing the abstract form AbsTerm of an expression. Optionally, it appends Moretokens
.
normalise(AbsTerm) -> Data
Types AbsTerm = Data = term()
Converts the abstract form AbsTerm of a term into a conventional Erlang data structure (i.e., the term itself). This is the inverse
of abstract/1 .
abstract(Data) -> AbsTerm
Types Data = AbsTerm = term()
Converts the Erlang data structure Data into an abstract form of type AbsTerm . This is the inverse of normalise/1 .
ERROR INFORMATION
The ErrorInfo mentioned above is the standard ErrorInfo structure which is returned from all IO modules. It has the format:
{ErrorLine, Module, ErrorDescriptor}
A string which describes the error is obtained with the following call:
Module:format_error(ErrorDescriptor)
SEE ALSO
io(3erl) , erl_scan(3erl) , ERTS User's Guide
Ericsson AB stdlib 1.17.3 erl_parse(3erl)