General :: Variable Declaration In Shell Scripts?
Feb 4, 2010
We have a file that declares many environmental variables. Out of which I have doubt on few. These variables are declared in UNIX environment. We are planing to migrate them along with applications to Linux.
Code:
export MAILSERVER="%new@hub"
MAIL_USERS="vinay.new"{MAILSERVER}",vijay.new"{MAILSERVER}
Does the above declarations work in Linux ?
The above declarations expands to
Code:
mail vinay.new%new@hub,vijay.new%new@hub
which looks little wierd.
[Code]...
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Nov 25, 2010
I made 2 files which are different from the program above one is temp1.h and another is temp2.c to understand how extern is used. So here is temp1.h
Code:
#include<stdlib.h>
typedef struct node * bond;
extern int jk;
and temp2.c is
Code:
#include<stdio.h>
#include<temp1.h>
struct node {
int data;
[code]...
I had declared jk in temp1.h as an extern int so why can I not initialize it in temp2.c?
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Jan 18, 2011
Why do I still get mutiple definition of "_my_variable" error even after I used the #ifndef preprocessor in my hpp file?
This is my scenario
I have:
1. A.cpp (including X.hpp)
2. B.cpp (including X.hpp)
3. X.hpp
[Code]...
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Apr 28, 2010
included shell script inside c program, and i wanted to assign the value of c variable to shell variable..Can any one please suggest me how to do it?
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Feb 9, 2010
Having real problem with below:
If I do:
I get the result I want (a file in format of <name><yyyy>-<mm>-<dd>.zip cut down to just yymmdd); but not if I try to set it as a variable ...
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Oct 7, 2010
I have a script in which I'm reading a file line by line and I'm finding certain position value using awk index as
Code:
# 2 spaces before open parens
pos=`echo | awk -v Line="$Line" '{ print index("'"$Line"'"," (")}'`
[code]....
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May 24, 2010
I am using Red Hat Linux Enterprise 5. I know the theory that -- using export to set environment variable, the environment variable will apply to current and child environment, but without using export to set environment variable, the environment variable will only apply to the current environment. What is the exact definition of "child environment" and "current environment"? For example,
Code:
$ var1=123
$ echo "Hello [$var1]"
The value of var1 (which is 123) is printed in shell, but I think echo is a command invoked by current shell, and it (the echo command) should be a child environment of current shell and the value of var1 should not (because not using export var1=123) impact echo.
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Nov 22, 2010
Why doesn't "var1=`echo $var2 | grep pattern`" work ?
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May 21, 2009
Is there a way to export a variable to parent shell in shell scripting ?
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Jan 28, 2010
I heard (although I can't find any sources for proof) that the USER environment variable may not be set in a old Unix shells (maybe even some obscure shells as well). What is the probability that it won't be set?
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Feb 8, 2010
On command line I have no problem storing a variable e.g
Code:
:~/bin$ process=`ps -ef | awk ' $8 == "idesk" { print $2 }'`
:~/bin$ echo $process
26736
:~/bin$
When I try to incorporate this into a shell script I get a blank.
Code:
:~/bin$ cat process_idesk
#!/bin/bash
process=`ps -ef | awk ' $8 == "idesk" { print $2 }'`
[code]....
The process_idesk script has been chmoded to be executable by the user. I'm sure there must be a silly omission on my behalf.
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Jan 19, 2011
I modified files in several directories, and need to run a diff on the backup I created before modifying the file.
I'm trying to compose a simple shell script to speed up the task, but getting a syntax error.
Here is what I have:
for i in DIR1 DIR2 DIR3 DIR4 DIR5 do;
diff /maindir/subdir/subdir/$i/filename.txt.old /maindir/subdir/subdir/$i/filename.txt;
done
I know the paths are valid, and if I run just the diff command with the actual DIR1 instead of $i it works.
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May 29, 2011
I have created a shell script to customise mv command, now i have achieved to accomplish all the functionality of mv by using alias. But i found difficulty in accomplish the funcionality with options [Like mv -i or mv -f etc.]. I thought about logic which check the first argument whether its starting with a minus [-] or not. if its starting with argument it will set a flag and execute accordingly. But whenever this condition is checked it shell script will throw error of destination operand missing. But the same will work with out option.
Note: I have used an minus[-] expression for decreasing a counter on the script above. The below mentioned is the portion of script. Sry for troubling Im not gud @scripting.
for i in $*
do
{
argument=`expr $argument - 1`
if [ $argument = 0 ];
then
exit
[Code]....
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Jul 23, 2010
I have been searching most of today and am stuck on getting a variable into an awk portion of my bash script. I have this working:
Code:
#!/bin/sh
SRC=/var/log/mail.log
DEST=/var/www/output/myFile.txt
VAR=userName@myDomain.tld
[code]....
Can awk take a shell variable? Or do I have to do something completely different?
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Jul 31, 2010
Code:
a=/this/is/a/dir.txt
dirname $a
[code]....
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May 4, 2010
Using things like awk/sed, but have managed to cobble together what I needed so far without a problem. The only thing I'm struggling with is to assign the content of a particular line as a variable, and then to use it again throughout the file.
For example, if what I want is the first line of the file to become the variable "from1", and then to replace the word "Subject" in the file with the string "Message from [from1]". What I thought would work
I tried a few diff combinations but nothing seems to work. All I get is the terminal hanging indefinitely.
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Sep 8, 2009
I have a application on linux , I can excute it in command line . but when I invoked it via CGI(perl) , it can not excute successfully , so I suspected that there is something different between SHELL and CGI environment , but I haven't figure out what the difference is .
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Aug 2, 2011
Code...
I am somewhat confident that there is a neater way.
Question: Does anybody know the answer?
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Dec 23, 2010
I have the following code :
Code:
E_BADARGS=65
if [ $# -ne 2 ] ; then
[code]...
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Oct 2, 2009
I have some messy code that I wrote a while back and I am trying to organize it. The program opens xpaint and uses xwit and xte to draw packman and so on. I want to split it all up I am going to add more to it. Basically like i would want drawing packman in one function i guess you could call it and then coloring him or the background in another
<code>
#!/bin/bash
pkill xpaint
res=`xwininfo -root | grep geom | sed -e 's/^.*try ([0-9][0-9]*x[0-9][0-9]*)+.*$/1/'`
Xoriginal=`echo $res | cut -d 'x' -f 1`
Yoriginal=`echo $res | cut -d 'x' -f 2`
X=`echo "($Xoriginal/2)-400" | bc `
Y=`echo "$Yoriginal/2" | bc `
#t=$(($Y/2))
bob=`echo "$Y/2" |bc `
echo $X
echo $Y
/usr/bin/xpaint -size "$Xoriginal"x"$Yoriginal" -popped &
sleep 4
paintersMom=`xwit -all -print | grep XP | cut -d ":" -f 1`
canvasWin=`xwit -all -print | grep Untitled | cut -d ":" -f 1`
#toolres=`xwininfo -id $paintersmom | grep geom | sed -e 's/^.*try ([0-9][0-9]*x[0-9][0-9]*)+.*$/1/'`
#canres=`xwininfo -id $canvasWin | grep geom | sed -e 's/^.*try ([0-9][0-9]*x[0-9][0-9]*)+.*$/1/'`
#echo $paintersMom
xwit -id $paintersMom -move 0 0
xwit -id $canvasWin -move 0 0
xwit -root -warp "$X" "$Y"
sleep 4
for((i=45; i < 315; i++))
do
xte 'mousedown 1'
ang=`./deg2rad $i`
movex=`echo "$X+$bob*c($ang)" | bc -l`
movey=`echo "$Y+$bob*s($ang)" | bc -l`
xwit -root -warp "$movex" "$movey"
done
xwit -root -warp "$X" "$Y"
xte 'mouseup 1'
#xwit -id $paintersMom -focus -raise
#sleep 1
#xwit -id $paintersMom -warp 30 390 #// fill in command on tool bar
#sleep 1
#xte 'mouseclick 1'
#sleep 1
#xwit -id $canvasWin -warp 221 40 #// color selection
#sleep 1
#xte 'mouseclick 1'
#sleep 1
#xwit -id $canvasWin -warp "$(($X-150))" "$Y" #//location on pac man
#sleep 1
#xte 'mouseclick 1'
#sleep 1
#xwit -id $canvasWin -warp 62 44 #// selecting color black
#sleep 1
#xte 'mouseclick 1'
#sleep 1
#xwit -root -warp 62 120 #// selecting back to canvas
#sleep 1
#xte 'mouseclick 1' #// color canvas black
#sleep 1
#xwit -id $paintersMom -focus -raise
#xwit -id $paintersMom -warp 27 108 #//click back to pencil
#sleep 1
#xte 'mouseclick 1'
#sleep 1
</code>
Here for example $paintersmom is would be in the drawing of pacman but I would also want to use it when I colored him in.. but I would want both processes in a different shell script.
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Jan 20, 2011
What I am trying to accomplish is a way to read only the lines that have been added to the file mylog0 since the last time the script looped (5 seconds). I am open to new suggestions too, I have been stuck on this little script for a few hours already.
Code: #!/bin/bash
i=0
firstline=0
[code]...
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Jun 24, 2010
I need to be able to set a variable that is used by my build environment. I need to be able to change this variable "on the fly" as I work with multiple build environments. A portion of the variable is arbitrary, so I need to treat the arbitrary portion of the variable as an argument.
I would normally just create an alias, but BASH doesn't support arguments to aliases. So the workaround for the no-alias-arguments bug is to use a script. No problem. Except the variable I set in the script does not exist when I exit the script.Now, if I run the script by using "$ . myscript" it works in that the variable is set after it exits. The problem is the argument checking I have in the script doesn't work anymore. BASH aliases don't support arguments and I can't export a variable from a script unless I source the script (is it even a script at that point?) Maybe I am simply taking the wrong approach.
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Nov 10, 2010
Code:
grep -r $SEARCHDIR --include="day_$YYYY-$MM-*" -h -o -e PATTERN
The above command does exactly what I want: limit the search of files in $SEARCHDIR to those specified by --include.
I use double quotes rather than single quotes because of the shell variables. I would have thought this would cause the shell to expand the "*" but this doesn't seem to be the case.
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Oct 28, 2010
I am trying to map the coordinates of a grid.
Code:
R=7 # number of rows (lines)
C=6 # number of columns
X=200 # initial horizontal location
Y=100 # initial vertical location
[code]....
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Jul 25, 2011
I'm using sed to remove certain line in a text file based on a match with 2 variables from input. Here is how it looks like in file
Philip S:Odds:45:343
Mike Junior:Odds:3:56
I prompt for 2 inputs in variable form which is compared to the first 2 fields of the above text (: seperated). So say i enter Philip S and Odds then it should delete the entire first line.
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Jul 7, 2010
I am trying to install this vpn thing for school (I need to access some of my info). I seem to get to the installation part somehow but I keep getting this message
Making module
make -C /lib/modules/2.6.31-17-generic/build SUBDIRS=/home/mblack3/Desktop/vpnclient modules
make[1]: Entering directory `/usr/src/linux-headers-2.6.31-17-generic'
CC [M] /home/mblack3/Desktop/vpnclient/linuxcniapi.o
/home/mblack3/Desktop/vpnclient/linuxcniapi.c:12:26: error: linux/config.h: No such file or directory .....
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Dec 28, 2010
I am trying to include a QWebView widget in my application. Every time I try to compile it, I just get these errors:
Code:
$ LANG=en_US make
g++ -c -pipe -O2 -march=i486 -mtune=i686 -Wall -W -D_REENTRANT -DQT_NO_DEBUG -DQT_WEBKIT_LIB -DQT_GUI_LIB -
[code].....
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Mar 28, 2009
I need to check whether a shell script variable contains non-zero numeric data to proceed. The variable should contain numeric values, but may in fact contain zeroes, blank space or nothing. So far, I have tried various combinations of:
Code:
if test $variable
then
if test $variable -gt 0
then
echo "good data exists"
else "no good data exists"
fi
fi
It partially works, but I get either "too many arguments" or "integer expression expected".
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Feb 17, 2011
how to assign a local variable value to a global variable....
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Jun 15, 2011
I'm trying to compile a main.c file that contains a while statement. Embedded in the while statement are functions that are being called. After the while statement, I have 2 more functions being called, one to find the average(getaverage), and one to print the results (printstuff). I also used a header file (my.h) that contains all of the needed #define and #include, along with each of the void function() statements.
There isn't any problems with the while statement/ the functions in while, but when I try and compile main.c I get the following errors:
main.c error: conflicting types for 'getaverage'
my.h error: previous declaration of 'getaverage'
and then the same thing for 'printstuff'
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