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1. Shell Programming and Scripting
Post #2 is the original post. This is the first answer to post #2
Hi, try:
awk '
{
match($0,/1+/)
b=substr($0,1,RSTART-1)
e=substr($0,RSTART+RLENGTH,length)
for(i=2^RLENGTH-2; i>0; i--) {
s=x; d=i
while(d) {
s=(d%2==0?0:1) s
... (12 Replies)
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Dear All,
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Thanks (8 Replies)
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3. Shell Programming and Scripting
Hi,
I have an input file like this
a
b
c
d
I want to print all possible combinations between these records in the following way
aVSb
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aVSd
bVSc
bVSd
cVSd
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5. Shell Programming and Scripting
Hello Scrutinizer / Group ,
The shell script of awk that Scrutinizer made calculate all possible permutations in this case 3125 (5 numbers) but i want to have only the 126 possible combination. For now it does not matter the specific order of the combination numbers.
I would appreciate it you... (1 Reply)
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Hi Team
when i do, echo on my host box it returns (see below)
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\$
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HI I have a series(sorted), which i require to create combinations. I am not getting the good code for doing this. My series should generate the following combinations... Please help me in getting this in C++. Thanks for your help.
A:
A
A B:
A
B
A B
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A
... (1 Reply)
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Hello All,
i have two files, one of the format
A 123
B 124
C 234
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And the other
A 678
B 789
C 689
D 567
I would like to combine them into one file with three columns:
A 123 678
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C 234 689 (4 Replies)
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4 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)