I'm sorry if this has already been posted somewhere but I can't seem to find it on the forums (or anywhere on google )
I am writing a script where a user must enter a single character to perform an action.
For example, Press Q to Quit or R to Refresh
Basically I am stuggling to come up with a way you can use the read function to read one character (without pressing enter or return) and then perform a command based on what character you entered.
The only solution I can find is read -n but this isn't available for me.
I've used the following code to perform a timed out read which will wait 1 second and then continue the code but it takes too long.
Does anyone have any idea how to read single character without having to press enter?
im having trouble doing this:
i have a variable with 2 characters repeating e.g. aababbbaaaababaabbaabbba
is there a way i can search the variable for a's and b's and then change a's to b's and b's to a's?
im guessing its like getting the 1's compliment of the string
im doing this in... (2 Replies)
Can someone help me to write a script / command to read in a file, character by character, replace any unknown ASCII characters with space. then write out the file to a new filename/
Thanks! (1 Reply)
Hi,
I've made a script to grep a file
for i in `cat filename.txt`
do
strings ./binfile | grep "$i" 2>&1 > /dev/null
done
this works fine as long as in filename.txt i don't have any entries with spaces. But in my case i want to grep something with spaces like "lala tata"
and... (3 Replies)
hello all
i request you to give the solution for the following problem..
I want read the text file.and print the contents character by character..like if the text file contains google means..i want to print
g
go
goo
goog
googl
google
like this Using unix Shell scripting...
without using... (1 Reply)
Hi all,
Greetings,
I have the following scenario, The contents of main file are like :
Unix|||||forum|||||||||||||||is||||||the||best
so||||||be|||||on||||||||||||||||||||||||||||||||||||||||||||it
And i need the output in the following form:
Unix=forum=is=the=best
so=be=on=it
... (3 Replies)
I have a bash loop that waits for a single key press, then does $something depending on what $key is pressed before refreshing the screen with updated data. The problem I have is that the script will store additional key presses and chain them together causing the screen to redraw and the script... (1 Reply)
Hi friend,
I have one file , and i want to read that file character by character.
I need this script in ksh.
while using read option with -n1 am getting error.
while read -n1 c read has bad option
And if i am using below script, then if in a line has space like this ( Pallvi mahajan)... (10 Replies)
Hello everybody,
I am using Windows 10 and cygwin/bash.
I need to write a script in bash which simulates opening of a program and then press some keys such as F5, ENTER and ALT+F4.
I have written a VBScript which does the job
Set WshShell = WScript.CreateObject("WScript.Shell")... (9 Replies)
I have a csv dataset like this :
C,rs18768
G,rs13785
GA,rs1065
G,rs1801279
T,rs9274407
A,rs730012
I'm thinking of use like awk, sed to covert the dataset to this format: (if it's two character, then keep the same)
CC,rs18768
GG,rs13785
GA,rs1065
GG,rs1801279
TT,rs9274407... (7 Replies)
Discussion started by: nengcheng
7 Replies
LEARN ABOUT LINUX
rbash
RBASH(1) General Commands Manual RBASH(1)NAME
rbash - restricted bash, see bash(1)RESTRICTED SHELL
If bash is started with the name rbash, or the -r option is supplied at invocation, the shell becomes restricted. A restricted shell is
used to set up an environment more controlled than the standard shell. It behaves identically to bash with the exception that the follow-
ing are disallowed or not performed:
o changing directories with cd
o setting or unsetting the values of SHELL, PATH, ENV, or BASH_ENV
o specifying command names containing /
o specifying a file name containing a / as an argument to the . builtin command
o specifying a filename containing a slash as an argument to the -p option to the hash builtin command
o importing function definitions from the shell environment at startup
o parsing the value of SHELLOPTS from the shell environment at startup
o redirecting output using the >, >|, <>, >&, &>, and >> redirection operators
o using the exec builtin command to replace the shell with another command
o adding or deleting builtin commands with the -f and -d options to the enable builtin command
o using the enable builtin command to enable disabled shell builtins
o specifying the -p option to the command builtin command
o turning off restricted mode with set +r or set +o restricted.
These restrictions are enforced after any startup files are read.
When a command that is found to be a shell script is executed, rbash turns off any restrictions in the shell spawned to execute the script.
SEE ALSO bash(1)GNU Bash-4.0 2004 Apr 20 RBASH(1)