11-28-2016
Whatever you mean by "nested" - yes, commands do behave identical, be they issued on the command line or run within a script.
This User Gave Thanks to RudiC For This Post:
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
I a file with log entries... I want to sort it so that the last line in the file is first and the first line is last..
eg.
Sample file
1
h
a
f
8
6
After sort should look like
6
8
f
a
h
1 (11 Replies)
Discussion started by: frustrated1
11 Replies
2. Shell Programming and Scripting
Say i have 2 files in the giving format:
file1
1 2 3 4
1 2 3 4
1 2 3 4
file2
1 2 3 4
1 2 3 4
1 2 3 4
I have a PERL code (loaned by one of u -i forgot who - thanks!) that extracts the 2nd column from each file and append horizontally to a new file:
perl -ane 'push @{$L->}, $F; close... (1 Reply)
Discussion started by: epi8
1 Replies
3. Shell Programming and Scripting
hai, how can i sort a file alphabetically without using sort command (6 Replies)
Discussion started by: rahul801
6 Replies
4. UNIX for Dummies Questions & Answers
How can I list the file under current directory both in alphabetical and in reverse alphabetical order? (1 Reply)
Discussion started by: g.ashok
1 Replies
5. Shell Programming and Scripting
What should be the Shell script that counts a number of unique word contained in a file and print them in alphabetical order line by line? (7 Replies)
Discussion started by: proactiveaditya
7 Replies
6. Shell Programming and Scripting
Hi
I have a requirement like below
I need to sort the files based on the timestamp in the file name and run them in sorted order and then archive all the files which are one day old to temp directory
My files looks like this
PGABOLTXML1D_201108121235.xml... (1 Reply)
Discussion started by: saidutta123
1 Replies
7. Shell Programming and Scripting
Hi everyone!
I am new to the forum and have recently started working with Linux.
Quick question, I want a user list in alphabetical order as the output of a shell script.
Who can help me!?
Thanks!
From the netherlands ;) (5 Replies)
Discussion started by: dennisbest85
5 Replies
8. UNIX for Dummies Questions & Answers
I've looking over a script for work and I've had a problem with the script not listing the files in alphabetical order. To look up PIDs for apps, it would be beneficial to have them listed in that order. Here is what I've been reviewing.
#!/usr/bin/perl
$str = sprintf "%4s %-40s", "PID",... (7 Replies)
Discussion started by: whysolucky
7 Replies
9. Shell Programming and Scripting
Hi, need help in sorting lines between strings "<section status = “ole-service”>" and "</section>" in alphabetical order, based on the text in red. Hoping for an AWK or SED solution. Thank you.
...
<section status = “ole-service”>...
<p service = "OOO">XZZ</p>
<p service = "AAA">AAA... (3 Replies)
Discussion started by: pioavi
3 Replies
10. Shell Programming and Scripting
Hi All,
I have one file containing thousands of table names in single column. Now I want that file split into multiple files e.g one file containing table names starting from A, other containing all tables starting from B...and so on..till Z.
I tried below but it did not work.
for i in... (6 Replies)
Discussion started by: shekhar_4_u
6 Replies
exec(1) User Commands exec(1)
NAME
exec, eval, source - shell built-in functions to execute other commands
SYNOPSIS
sh
exec [argument...]
eval [argument...]
csh
exec command
eval argument...
source [-h] name
ksh
*exec [arg...]
*eval [arg...]
DESCRIPTION
sh
The exec command specified by the arguments is executed in place of this shell without creating a new process. Input/output arguments may
appear and, if no other arguments are given, cause the shell input/output to be modified.
The arguments to the eval built-in are read as input to the shell and the resulting command(s) executed.
csh
exec executes command in place of the current shell, which terminates.
eval reads its arguments as input to the shell and executes the resulting command(s). This is usually used to execute commands generated as
the result of command or variable substitution.
source reads commands from name. source commands may be nested, but if they are nested too deeply the shell may run out of file descrip-
tors. An error in a sourced file at any level terminates all nested source commands.
-h Place commands from the file name on the history list without executing them.
ksh
With the exec built-in, if arg is given, the command specified by the arguments is executed in place of this shell without creating a new
process. Input/output arguments may appear and affect the current process. If no arguments are given the effect of this command is to mod-
ify file descriptors as prescribed by the input/output redirection list. In this case, any file descriptor numbers greater than 2 that are
opened with this mechanism are closed when invoking another program.
The arguments to eval are read as input to the shell and the resulting command(s) executed.
On this man page, ksh(1) 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.
EXIT STATUS
For ksh:
If command is not found, the exit status is 127. If command is found, but is not an executable utility, the exit status is 126. If a redi-
rection error occurs, the shell exits with a value in the range 1-125. Otherwise, exec returns a zero exit status.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO
csh(1), ksh(1), sh(1), attributes(5)
SunOS 5.10 17 Jul 2002 exec(1)