10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
I would like to add the ability to change the message that is displayed when timer is finished. At present it just asks for the time I want for the alarm.
I think what I need is another command line argument.
soundfile="/usr/share/sounds/My_Sounds/Alarm-sound-buzzer.mp3"... (5 Replies)
Discussion started by: drew77
5 Replies
2. UNIX for Beginners Questions & Answers
Hi Guys, I'm trying to work out how to add a command line argument inside single quotes. Would anyone be able to help please as I'm going mad :)
I want to be able to place the filename on command line and it then be used in a script but it needs to have quotes surrounding it.
Thanks in... (4 Replies)
Discussion started by: mutley2202
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3. Shell Programming and Scripting
I'm trying to write a bash script called YN that looks like the following
YN "Specify a question" "doThis" "doThat"
where "doThis" will be executed if the answer is "y", otherwise "doThat".
For example
YN "Do you want to list the file dog?" "ls -al dog" ""
Here's my attempt... (3 Replies)
Discussion started by: LeoKSimon
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4. Homework & Coursework Questions
1. The problem statement, all variables and given/known data:
create a shell script, chExt.sh that takes one or more parameters, where the first is a desired extension and the remainder are names of files to be renamed. For each file in the command line, this script should rename the file, as... (6 Replies)
Discussion started by: kcoll025
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5. Shell Programming and Scripting
Hi Guys
When I run the below command
ssh -o 'PasswordAuthentication yes' -o 'PreferredAuthentications publickey' -i $HOME/.ssh/id_dsa Server_Name
I found the below error
ommand-line line 0: Missing yes/no argument
Kindly help me to sort out
Double post, continued... (0 Replies)
Discussion started by: Pratik4891
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6. Shell Programming and Scripting
If ($argv == “-debug”) then
Echo “in loop”
Endif
But this is not working. If I modify this code and remove “-“, then it works.
Similarly I am getting problem using grep command also
Grep “-debug” Filename
Can someone please help me on how to resolve these... (1 Reply)
Discussion started by: sarbjit
1 Replies
7. Programming
Hi,
I have a very simple C program which will run in UNIX. When i am passing * as the command line argument, i am gettig the below output.
Program:
#include <stdio.h>
#include "mylibrary.h"
int **environ;
int main(int argc,char *argv)
{
int i;
printf("\nHello... (2 Replies)
Discussion started by: dsudipta
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8. Shell Programming and Scripting
Hi ,
I have a piece of code ...wherein I need to assign the following ...
1) A command line argument to a variable
e.g origCount=ARGV
2) A unix command to a variable
e.g result=`wc -l testFile.txt`
in my awk shell script
When I do this :
print "origCount" origCount --> I get the... (0 Replies)
Discussion started by: sweta_doshi
0 Replies
9. Shell Programming and Scripting
Say I want to get the value of last command line argument using the value in $# (or some other way if u can suggest) how do I do it??
$"$#"
`$"$#"`
These don't work :( (4 Replies)
Discussion started by: amit_oddey21
4 Replies
10. UNIX for Dummies Questions & Answers
hello,
can any help me how to can pass array as command line argument in korn shell.
also how to read a array from command line.
thanks
spandu (2 Replies)
Discussion started by: spandu
2 Replies
shell_builtins(1) shell_builtins(1)
NAME
shell_builtins, case, for, foreach, function, if, repeat, select, switch, until, while - shell command interpreter built-in commands
The shell command interpreters csh(1), ksh(1), and sh(1) have special built-in commands. The commands case, for, foreach, function, if,
repeat, select, switch, until, and while are commands in the syntax recognized by the shells. They are described in the Commands section of
the manual pages of the respective shells. The remaining commands listed in the table below are built into the shells for reasons such as
efficiency or data sharing between command invocations. They are described on their respective manual pages.
|
Command | Shell
alias |csh, ksh
bg |csh, ksh, sh
break |csh, ksh, sh
case |csh, ksh, sh
cd |csh, ksh, sh
chdir |csh, sh
continue |csh, ksh, sh
dirs |csh
echo |csh, ksh, sh
eval |csh, ksh, sh
exec |csh, ksh, sh
exit |csh, ksh, sh
export |ksh, sh
false |ksh
fc |ksh
fg |csh, ksh, sh
for |ksh, sh
foreach |csh
function |ksh
getopts |ksh, sh
glob |csh
goto |csh
hash |ksh, sh
hashstat |csh
history |csh
if |csh, ksh, sh
jobs |csh, ksh, sh
kill |csh, ksh, sh
let |ksh
limit |csh
login |csh, ksh, sh
logout |csh, ksh, sh
nice |csh
newgrp |ksh, sh
nohup |csh
notify |csh
onintr |csh
popd |csh
print |ksh
pushd |csh
pwd |ksh, sh
read |ksh, sh
readonly |ksh, sh
rehash |csh
repeat |csh
return |ksh, sh
select |ksh
set |csh, ksh, sh
setenv |csh
shift |csh, ksh, sh
source |csh
stop |csh, ksh, sh
suspend |csh, ksh, sh
switch |csh
test |ksh, sh
time |csh
times |ksh, sh
trap |ksh, sh
true |ksh
type |ksh, sh
typeset |ksh
ulimit |ksh, sh
umask |csh, ksh, sh
unalias |csh, ksh
unhash |csh
unlimit |csh
unset |csh, ksh, sh
unsetenv |csh
until |ksh, sh
wait |csh, ksh, sh
whence |ksh
while |csh, ksh, sh
Bourne Shell, sh, Special Commands
Input/output redirection is now permitted for these commands. File descriptor 1 is the default output location. When Job Control is
enabled, additional Special Commands are added to the shell's environment.
In addition to these built-in reserved command words, sh also uses:
: No effect; the command does nothing. A zero exit code is returned.
.filename Read and execute commands from filename and return. The search path specified by PATH is used to find the directory con-
taining filename.
C shell, csh
Built-in commands are executed within the C shell. If a built-in command occurs as any component of a pipeline except the last, it is exe-
cuted in a subshell. In addition to these built-in reserved command words, csh also uses:
: Null command. This command is interpreted, but performs no action.
Korn Shell, ksh, Special Commands
Input/Output redirection is permitted. Unless otherwise indicated, the output is written on file descriptor 1 and the exit status, when
there is no syntax error, is zero.
Commands that are preceded by one or two * (asterisks) are treated specially in the following ways:
1. Variable assignment lists preceding the command remain in effect when the command completes.
2. I/O redirections are processed after variable assignments.
3. Errors cause a script that contains them to abort.
4. Words, following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari-
able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation are not
performed.
In addition to these built-in reserved command words, ksh also uses:
* : [ arg ... ] The command only expands parameters.
* .file [ arg ..Read the complete file then execute the commands. The commands are executed in the current shell environment. The search
path specified by PATH is used to find the directory containing file. If any arguments arg are given, they become the posi-
tional parameters. Otherwise, the positional parameters are unchanged. The exit status is the exit status of the last com-
mand executed. the loop termination test.
intro(1), alias(1), break(1), cd(1), chmod(1), csh(1), echo(1), exec(1), exit(1), find(1), getoptcvt(1), getopts(1), glob(1), hash(1), his-
tory(1), jobs(1), kill(1), ksh(1), let(1), limit(1), login(1), logout(1), newgrp(1), nice(1), nohup(1), print(1), pwd(1), read(1), read-
only(1), set(1), sh(1), shift(1), suspend(1), test(1B), time(1), times(1), trap(1), typeset(1), umask(1), wait(1), chdir(2), chmod(2),
creat(2), umask(2), getopt(3C), profile(4), environ(5)
29 Jun 2005 shell_builtins(1)