10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hello. There is my one-liner to get subjects of potential spam mails
sudo exiqgrep -bf "spamer@example.com" |cut -d' ' -f1 |xargs -I ~ sudo /usr/sbin/exim -Mvh ~ |grep 'Subject: '
I want to insert blank line after each iteration to make output more readable. I tried
sudo exiqgrep -bf... (1 Reply)
Discussion started by: urello
1 Replies
2. Shell Programming and Scripting
Hi
I need to write a script to ssh through several hops (e.g. HostA-HostB-HostC-HostD), where Host A does not have direct assess to HostC ; HostB cannot access HostD directly.
when I ssh 3 hops and run command with arg1, arg2 and redirect the output to a file, e.g.
HostA> ssh -t HostB ssh -t... (3 Replies)
Discussion started by: chiensh
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3. Shell Programming and Scripting
Let's say I have a file called test.out. In this file I want to do the following:
1. Search for DIP-10219 and with this:
2. Remove everything in front of cn=
3. Remove everything after *com
4. Remove duplicate lines
5. Replace ( with \(
6. Replace ) with \)
For 1-3 I have figured out this... (11 Replies)
Discussion started by: exm
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4. Shell Programming and Scripting
for example:
I'm greping the process where i can get the location of the file
$ ps -ef | grep LLAWP | awk {'print $9'} | tail -1
/Hostname/ihs/INSTANCE2/conf/WebAgent.conf
then I need to display second line of WebAgent.conf file:
$ cat /Hostname/ihs/INSTANCE1/conf/WebAgent.conf | head... (2 Replies)
Discussion started by: raghur77
2 Replies
5. Shell Programming and Scripting
Hi,
I am using solaris 10 and bash shell.Script execution follows below.Initially it will check whether a directory exists or not if does not exist it will create it.(This I have completed)
Second step:I have four users say user1,user2,user3,user4.Script should prompt for the user id and... (11 Replies)
Discussion started by: muraliinfy04
11 Replies
6. Shell Programming and Scripting
Requirement:
Run a shell script with below inputs
file name
checksum
path
the script should go to multiple servers (around 35) and verify the input cksum and if there is a mismatch display a simple message to the user that cksum verification failed.
host details, user id /... (1 Reply)
Discussion started by: amicableperson
1 Replies
7. Shell Programming and Scripting
Hi,
I have one text file input.txt, which has folders path as follows:
/home/user/automate/abc
/home/user/automate/abc/xyz
/home/user/automate/test
/home/user/automate/test2
/home/user/automate/test2/abc/Main
In those folders i have .svn folder.
1) First i want to remove .svn like rm... (5 Replies)
Discussion started by: dragon.1431
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8. UNIX for Dummies Questions & Answers
have to run multiple commands at a
specified time by the user... (3 Replies)
Discussion started by: hemaa
3 Replies
9. Shell Programming and Scripting
I am checking that a file is older than a reference file that I build with a touch command before processing it. If it is not old enough, I want to sleep for an hour and check again.
My problem is if it is old enough to process, I want to exit when I am done, but I cannot find a way to exit... (2 Replies)
Discussion started by: prismtx
2 Replies
10. Shell Programming and Scripting
New to shell scripting.
I can't get my script to execute multiple commands.
Here's the code. It's a menu script.
#!/bin/ksh
clear
print "SDE MENU"
PS3="SDE MENU, enter choice:"
select clean_menu in "tasdedev instance 5151" "orkindev instance 5155" "tasdetst
instance 5157" "orkinsys... (1 Reply)
Discussion started by: hvincent
1 Replies
XARGS(1) BSD General Commands Manual XARGS(1)
NAME
xargs -- construct argument list(s) and execute utility
SYNOPSIS
xargs [-0oprt] [-E eofstr] [-I replstr [-R replacements] [-S replsize]] [-J replstr] [-L number] [-n number [-x]] [-P maxprocs] [-s size]
[utility [argument ...]]
DESCRIPTION
The xargs utility reads space, tab, newline and end-of-file delimited strings from the standard input and executes utility with the strings
as arguments.
Any arguments specified on the command line are given to utility upon each invocation, followed by some number of the arguments read from the
standard input of xargs. This is repeated until standard input is exhausted.
Spaces, tabs and newlines may be embedded in arguments using single (`` ' '') or double (``"'') quotes or backslashes (``''). Single quotes
escape all non-single quote characters, excluding newlines, up to the matching single quote. Double quotes escape all non-double quote char-
acters, excluding newlines, up to the matching double quote. Any single character, including newlines, may be escaped by a backslash.
The options are as follows:
-0 Change xargs to expect NUL (`` '') characters as separators, instead of spaces and newlines. This is expected to be used in concert
with the -print0 function in find(1).
-E eofstr
Use eofstr as a logical EOF marker.
-I replstr
Execute utility for each input line, replacing one or more occurrences of replstr in up to replacements (or 5 if no -R flag is speci-
fied) arguments to utility with the entire line of input. The resulting arguments, after replacement is done, will not be allowed to
grow beyond replsize (or 255 if no -S flag is specified) bytes; this is implemented by concatenating as much of the argument contain-
ing replstr as possible, to the constructed arguments to utility, up to replsize bytes. The size limit does not apply to arguments
to utility which do not contain replstr, and furthermore, no replacement will be done on utility itself. Implies -x.
-J replstr
If this option is specified, xargs will use the data read from standard input to replace the first occurrence of replstr instead of
appending that data after all other arguments. This option will not affect how many arguments will be read from input (-n), or the
size of the command(s) xargs will generate (-s). The option just moves where those arguments will be placed in the command(s) that
are executed. The replstr must show up as a distinct argument to xargs. It will not be recognized if, for instance, it is in the
middle of a quoted string. Furthermore, only the first occurrence of the replstr will be replaced. For example, the following com-
mand will copy the list of files and directories which start with an uppercase letter in the current directory to destdir:
/bin/ls -1d [A-Z]* | xargs -J % cp -rp % destdir
-L number
Call utility for every number lines read. If EOF is reached and fewer lines have been read than number then utility will be called
with the available lines.
-n number
Set the maximum number of arguments taken from standard input for each invocation of utility. An invocation of utility will use less
than number standard input arguments if the number of bytes accumulated (see the -s option) exceeds the specified size or there are
fewer than number arguments remaining for the last invocation of utility. The current default value for number is 5000.
-o Reopen stdin as /dev/tty in the child process before executing the command. This is useful if you want xargs to run an interactive
application.
-P maxprocs
Parallel mode: run at most maxprocs invocations of utility at once.
-p Echo each command to be executed and ask the user whether it should be executed. An affirmative response, 'y' in the POSIX locale,
causes the command to be executed, any other response causes it to be skipped. No commands are executed if the process is not
attached to a terminal.
-r Compatibility with GNU xargs. The GNU version of xargs runs the utility argument at least once, even if xargs input is empty, and it
supports a -r option to inhibit this behavior. The NetBSD version of xargs does not run the utility argument on empty input, but it
supports the -r option for command-line compatibility with GNU xargs; but the -r option does nothing in the NetBSD version of xargs.
-R replacements
Specify the maximum number of arguments that -I will do replacement in. If replacements is negative, the number of arguments in
which to replace is unbounded.
-S replsize
Specify the amount of space (in bytes) that -I can use for replacements. The default for replsize is 255.
-s size
Set the maximum number of bytes for the command line length provided to utility. The sum of the length of the utility name, the
arguments passed to utility (including NULL terminators) and the current environment will be less than or equal to this number. The
current default value for size is ARG_MAX - 4096.
-t Echo the command to be executed to standard error immediately before it is executed.
-x Force xargs to terminate immediately if a command line containing number arguments will not fit in the specified (or default) command
line length.
If utility is omitted, echo(1) is used.
Undefined behavior may occur if utility reads from the standard input.
The xargs utility exits immediately (without processing any further input) if a command line cannot be assembled, utility cannot be invoked,
an invocation of utility is terminated by a signal, or an invocation of utility exits with a value of 255.
FILES
/dev/tty used to read responses in prompt mode
EXIT STATUS
xargs exits with one of the following values:
0 All invocations of utility returned a zero exit status.
123 One or more invocations of utility returned a nonzero exit status.
124 The utility exited with a 255 exit status.
125 The utility was killed or stopped by a signal.
126 The utility was found but could not be invoked.
127 The utility could not be found.
1 Some other error occurred.
SEE ALSO
echo(1), find(1), execvp(3)
STANDARDS
The xargs utility is expected to be IEEE Std 1003.2 (``POSIX.2'') compliant. The -J, -o, -P, -R, and -S options are non-standard FreeBSD
extensions which may not be available on other operating systems.
HISTORY
The xargs utility appeared in PWB UNIX 1.0. It made its first BSD appearance in the 4.3 Reno release.
The meaning of 123, 124, and 125 exit values and the -0 option were taken from GNU xargs.
BUGS
If utility attempts to invoke another command such that the number of arguments or the size of the environment is increased, it risks
execvp(3) failing with E2BIG.
The xargs utility does not take multibyte characters into account when performing string comparisons for the -I and -J options, which may
lead to incorrect results in some locales.
BSD
December 21, 2010 BSD