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Top Forums Shell Programming and Scripting Rewriting standard output lines Post 302241149 by Lakris on Sunday 28th of September 2008 01:55:24 PM
Old 09-28-2008
Hi, You could try something like this... You may need to find a way to enable escape sequences in Your shell if it's not enabled by default. The trick here is to send BCKSPC with echo.

Code:
#!/bin/sh
echo Started program...
echo -n "Progress: 00" 
for x in $(seq -w 1 10); do # or some other loop condition
	sleep 1 #Or some other useful code here...
	echo -n "\b\b${x}"
done
echo

And You will have be wary of any other output produced by Your program, for example, if Your actions corresponding to sleep above actually writes stuff to stdout, You may want to redirect it temporarily to a file, which You can display after the loop is done.

/lakris
 

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cat(1)							      General Commands Manual							    cat(1)

Name
       cat - concatenate and print data

Syntax
       cat [ -b ] [ -e ] [ -n ] [ -s ] [ -t ] [ -u ] [ -v ] file...

Description
       The  command reads each file in sequence and displays it on the standard output.  Therefore, to display the file on the standard output you
       type:
       cat file
       To concatenate two files and place the result on the third you type:
       cat file1 file2 > file3
       To concatenate two files and append them to a third you type:
       cat file1 file2 >> file3
       If no input file is given, or if a minus sign (-) is encountered as an argument, reads from the standard input file.  Output is buffered in
       1024-byte blocks unless the standard output is a terminal, in which case it is line buffered.  The utility supports the processing of 8-bit
       characters.

Options
       -b   Ignores blank lines and precedes each output line with its line number.

       -e   Displays a dollar sign ($) at the end of each output line.

       -n   Precedes all output lines (including blank lines) with line numbers.

       -s   Squeezes adjacent blank lines from output and single spaces output.

       -t   Displays non-printing characters (including tabs) in output.  In addition to those representations used with the -v  option,  all  tab
	    characters are displayed as ^I.

       -u   Unbuffers output.

       -v   Displays  non-printing  characters (excluding tabs and newline) as the ^x.	If the character is in the range octal 0177 to octal 0241,
	    it is displayed as M-x. The delete character (octal 0177) displays as ^?.  For example, is displayed as ^X.

See Also
       cp(1), ex(1), more(1), pr(1), tail(1)

																	    cat(1)
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