@bartus11
Would it be safer to put double quotes around the $4?:
@jlliagre
What exactly does "${4:+-d $4}" mean? Can this be applied to the other arguments as well, to make them optional?
Hi,
I am trying to call a function inside a shell script. Is there a way in which I can make the parameters options in the call?
Please help me with this.
Thanks!!! (2 Replies)
I have no idea what the following means. The teacher is too advanced for me to understand fully. We literally went from running a few commands over the last few months to starting shell scripting. I am not a programmer, I am more hardware oriented. I wish I knew what this question was asking... (3 Replies)
This is what I have:
#!/bin/bash
#ascript.sh
WORD1=`tail -n +$1 /home/gscn/word1.txt | head -1`
sed -e "s/WORD1/$WORD1/g" < /home/gscn/configtmp > /home/gscn/config
WORD2=`tail -n +$1 /home/gscn/word2.txt | head -1`
sed -e "s/WORD2/$WORD2/g" < /home/gscn/config2tmp >... (4 Replies)
Hello,
I have a shell script "Test.ksh" and I need to pass 8 parameters/arguments while executing the script
./Test.ksh 1 2 3 4 5 6 7 8
Out of these I want first 3 to be compulsory and rest 5 to be optional. Can you suggest the way to do this like and also how to pass these optional... (3 Replies)
How to declare the two argument for optional switch ?
I have a script that search for a string in current or old zipped log file.
Im using a option something like this
${basename}
Since $1 can have only one argument should be passed when user select swicth -c and -o need to... (3 Replies)
I have an awk script which can be used in the following ways:
xi and xf will only be mandatory when processing the file fin.zc.
awk -v xi=0/-0.5 -v xf=80/30 -f ./zc2cmd.awk fin.zc > fout.cmod
awk -f ./zc2cmd.awk -u
awk -f ./zc2cmd.awk --usg
awk -f ./zc2cmd.awk -e
awk -f ./zc2cmd.awk... (1 Reply)
Hello,
I have to make a shell script doing that :
the program tests if there is an argument, if there is it checks whether this is a directory or not, If it is it opens it.
for any .c file in the directory it prints 2 lines in the screen :
the dependence line of the .o and compiler commend... (1 Reply)
Hi,
I have a shell script, when run it i get a prompt to enter arguments say 1 for doing my next task otherwise q for quit.
What I am trying to do is run the shell script with the argument passed in however it does not seem to work.
This is what I did
./test.sh 1
Instead it printed the line... (6 Replies)
I need to run a local shell script on a remote machine. I am able to achieve that by executing the command
> ssh -qtt user@host < test.sh
However, when I try to pass arguments to test.sh it fails.
Any pointers would be appreciated. (7 Replies)
Hello
I would like to write a bash shell script which will need user to supply one variable which is mandatory and some other optional variables. If mandatory variable is not supplied by user, the script will exit. If optional values are not supplied by user, hard-coded value (in the script)... (3 Replies)
Discussion started by: atanubanerji
3 Replies
LEARN ABOUT BSD
xargs
XARGS(1) General Commands Manual XARGS(1)NAME
xargs - construct argument list(s) and execute utility
SYNOPSIS
xargs [ -t ][[ -x ] -n number ][ -s size ][ utility [ arguments... ]]
DESCRIPTION
The xargs utility reads space, tab, newline and end-of-file delimited arguments from the standard input and executes the specified utility
with them as arguments.
The utility and any arguments specified on the command line are given to the utility upon each invocation, followed by some number of the
arguments read from standard input. The utility is repeatedly executed 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 characters, excluding newlines, up to the matching double quote. Any single character, including newlines, may be escaped by a back-
slash.
The options are as follows:
-n number Set the maximum number of arguments taken from standard input for each invocation of the 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.
-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 and
the arguments passed to utility (including /dev/null terminators) will be less than or equal to this number. The current default
value for size is ARG_MAX - 2048.
-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 no utility is specified, 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 the utility is terminated by a signal or an invocation of the utility exits with a value of 255.
The xargs utility exits with a value of 0 if no error occurs. If utility cannot be invoked, xargs exits with a value of 127. If any other
error occurs, xargs exits with a value of 1.
SEE ALSO echo(1), find(1)STANDARDS
The xargs utility is expected to be IEEE Std 1003.2("POSIX") compliant.
June 6, 1993 XARGS(1)