Hi friends,
One of my shell program(test.ksh) contains the following if loop.Can anyone please explain me how this loop will work
The shell script will be executed as test.ksh -d all
The value of variables are
Code:
user=all
opt=-d
Code:
if [ "${user}" = "all" ] && [ "${opt}" = "-d" ]
then
[ X"${1}" = X ] && _del_all_w=1 || _group="${1}"
_del_all_usr_w=1
else
# Ensure generic id is specified.
[ X"${1}" = X ] &&
{
echo "${USAGE}" >&2
exit ${ERROR}
} || group="${1}"
Hi All
Just started with shell scripts and am stumped by, what is to most of you no doubt, a simple issue.
All I'm trying to do is prompt a user for input and writing to a log file. If the user types the word 'stop', then the program should halt. If the word typed is 'clear', then the log file... (2 Replies)
Hello Guys,
I'm new to Shell scripting, and i need someone to help me with this issue:
I'm trying to do a dynamic update query on Sysbase database table using shell script.
Lets say, the Update query is "update Table set id=X" , where X is dynamic value for the loop index.
If the loop is... (10 Replies)
Filename.txt
My First Line
My Second Line
::::While Loop:::
Program:
while read line
do
echo "$line"
done < Filename.txt
output:
My First Line
My Second Line
Is it possible to use for loop to get the same output.
I have tried executing below code but i get every word of my file... (8 Replies)
Hi,
I'm trying to build a shell script that reads a set of accounts from a file. For each account I need to perform a set of sql queries. So I have a loop with a set of sqlplus connections to retrieved my data.
Is it possible to have a single sqlplus connection before entering the loop and... (4 Replies)
I have a txt file with contents of acct nbr's like:
22222222222
33333333333
33445566778
I need to write a script which takes each acct nbr in the file and run the query like:
select seq_nbr from event where acct_nbr='22222222222'
and the query's output should be passed to a... (0 Replies)
I have a txt file with contents of acct nbr's like:
22222222222
33333333333
33445566778
I need to write a script which takes each acct nbr in the file and run the query like:
select seq_nbr from event where acct_nbr='22222222222'
and the query's output should be passed to a... (2 Replies)
Hi there
Looking for help with formating text output.
I have following file
1ABC1234567890123Y 31-Jul-2012
1DEF1234567890124NMEDIUM 31-Jul-2012
193939312345889 YSMALL 31-Jul-2012
10093939312345889YSMALL 31-Jul-2012
1 YSMALL 31-Jul-2012
... (14 Replies)
I have a script script.shwhich is scheduled to run at 11 AM everyday.
# script.sh Code:
./scb_script.sh &
unfortunately scb_script.sh is running today in infinite loop as respective files are not available.
My question, when script.sh starts running tomorrow, will the old process be... (1 Reply)
Hi all...
I am using a for loop for another part of AudioScope...
Consider this code:-
for n in {0..100}
do
if }" = "another_string" ]
then
break
fi
done
This works perfectly except I am not sure if breaking out of a 'for' loop might cause... (2 Replies)
Hi, its getting aborted with below IF loop, can plz guide me what im missing here
if || ; then
echo "print $APPEND"
fi (3 Replies)
Discussion started by: JSKOBS
3 Replies
LEARN ABOUT SUNOS
case
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)
04-20-2012
