Very strange things happened in the shell function Post: 302180123

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Top Forums Shell Programming and Scripting Very strange things happened in the shell function Post 302180123 by tpltp on Saturday 29th of March 2008 11:38:39 PM

03-30-2008

Registered User

Very strange things happened in the shell function

Here is the script:

Code:

#!/bin/bash
#set -xv
RAWDATAFILE="temp1"
GOODDATAFILE="temp2"
FindSOS()
{
local NUM=0 #return value for the id of SOS
local cnt=1
if grep "EOS" $1
then
sed -e 's/.*<CobDate>//' -e 's/<\/.*//' <$1 > ${RAWDATAFILE}
sed -n -e '/EOS/,/SOS/ s/[0-9]*/&/p' <${RAWDATAFILE} >${GOODDATAFILE}
NUM=`more ${GOODDATAFILE} |sed -e 's/<EOS\/>//' -e 's/<SOS\/>//' |grep -v '^$'`
else            #The <SOS/> must be in the second line, the required EID is in the
                # first line
while read line
do
if [ ${cnt} -eq 1 ]; then
eval NUM=${line}
break
fi
cnt=$(($cnt+1))
done <$1

fi

echo $NUM
}

echo $NUM
exit 0

Here is the result:

Code:

./FindSOS.ksh sosofile
RAWDATAFILE="temp1"
+ RAWDATAFILE=temp1
GOODDATAFILE="temp2"
+ GOODDATAFILE=temp2
FindSOS()
{
local NUM=0 #return value for the id of SOS
local cnt=1
if grep "EOS" $1
then
sed -e 's/.*<CobDate>//' -e 's/<\/.*//' <$1 > ${RAWDATAFILE}
sed -n -e '/EOS/,/SOS/ s/[0-9]*/&/p' <${RAWDATAFILE} >${GOODDATAFILE}
NUM=`more ${GOODDATAFILE} |sed -e 's/<EOS\/>//' -e 's/<SOS\/>//' |grep -v '^$'`
else            #The <SOS/> must be in the second line, the required EID is in the
                # first line
while read line
do
if [ ${cnt} -eq 1 ]; then
eval NUM=${line}
break
fi
cnt=$(($cnt+1))
done <$1

fi

echo $NUM
}
id=`FindSOS $1`
FindSOS $1
++ FindSOS sosofile
++ local NUM=0
++ local cnt=1
++ grep EOS sosofile
++ sed -e 's/.*<CobDate>//' -e 's/<\/.*//'
++ sed -n -e '/EOS/,/SOS/ s/[0-9]*/&/p'
more ${GOODDATAFILE} |sed -e 's/<EOS\/>//' -e 's/<SOS\/>//' |grep -v '^$'
+++ more temp2
+++ sed -e 's/<EOS\/>//' -e 's/<SOS\/>//'
+++ grep -v '^$'
++ NUM=2080370166
++ echo 2080370166
+ id='<EOS/>
2080370166'
echo $id
+ echo '<EOS/>' 2080370166
<EOS/> 2080370166
exit 0
+ exit 0

I feel strange about that in the function, the NUM=2080370166, but why out of the function, id get the value, the value changes to "<EOS/> 2080370166"

Did I miss something here? Thank you

tpltp

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rbash

RBASH(1)						      General Commands Manual							  RBASH(1)

NAME

       rbash - restricted bash, see bash(1)

RESTRICTED SHELL

       If  bash  is  started with the name rbash, or the -r option is supplied at invocation, the shell becomes restricted.  A restricted shell is
       used to set up an environment more controlled than the standard shell.  It behaves identically to bash with the exception that the  follow-
       ing are disallowed or not performed:

       o      changing directories with cd

       o      setting or unsetting the values of SHELL, PATH, ENV, or BASH_ENV

       o      specifying command names containing /

       o      specifying a filename containing a / as an argument to the .  builtin command

       o      specifying a filename containing a slash as an argument to the -p option to the hash builtin command

       o      importing function definitions from the shell environment at startup

       o      parsing the value of SHELLOPTS from the shell environment at startup

       o      redirecting output using the >, >|, <>, >&, &>, and >> redirection operators

       o      using the exec builtin command to replace the shell with another command

       o      adding or deleting builtin commands with the -f and -d options to the enable builtin command

       o      using the enable builtin command to enable disabled shell builtins

       o      specifying the -p option to the command builtin command

       o      turning off restricted mode with set +r or set +o restricted.

       These restrictions are enforced after any startup files are read.

       When a command that is found to be a shell script is executed, rbash turns off any restrictions in the shell spawned to execute the script.

SEE ALSO

       bash(1)

GNU Bash-4.0							    2004 Apr 20 							  RBASH(1)