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Read file and change a 0 to a 1 in output

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Homework and Emergencies Emergency UNIX and Linux Support Read file and change a 0 to a 1 in output
# 1  
Old 09-30-2009
Read file and change a 0 to a 1 in output
Code:
<key>ExcludeSimpleHostnames</key>
                <integer>0</integer>
                <key>FTPPassive</key>

Need simple command that will change the 0 to a 1 in this file when I grep it, but only for this integer key directly after the ExcludeSimpleHostnames key.

I got this output code from running:
Code:
grep -iA2  excludesimplehostnames /Library/Preferences/SystemConfiguration/preferences.plist

# 2  
Old 09-30-2009
check syntax on '&&' in if condition, otherwise, should work
Code:
PREVLINE=""
CURRLINE=""
while read line
do
    PREVLINE=$CURRLINE
    CURRLINE=$line
    CONTAINSKEY=`echo $PREVLINE|grep -c ExcludeSimpleHostnames`
    CONTAINSINT=`echo $CURRLINE|grep -c "<integer>0<"`
    if [ $CONTAINSKEY -eq 1 && $CONTAINSINT -eq 1 ]
    then
         echo $line|sed 's/0/1/' >> outputfile
    else
         echo $line >> outputfile
    fi
done < infile

Last edited by varontron; 09-30-2009 at 02:28 PM..
# 3  
Old 09-30-2009
Here's another solution, and this assumes you DO NOT want the other lines in the file printed. It uses awk's "range" operator.
Code:
awk '/<key>ExcludeSimpleHostnames<\/key>/,/<key>/ { sub(/>0</,">1<"); print; }'

Here's another way that prints out everything else:
Code:
awk 's { sub(/>0</,">1<");s=0; } /<key>ExcludeSimpleHostnames</ { s=1;} { print; }'

The second one consists of 3 awk pattern/program pairs. The first is for when you are the target line, and s is non-zero one input line after the 2nd pattern/program, which set s to non-zero. The third pattern/program prints out every line.
# 4  
Old 09-30-2009
Write line to config file
Code:
<key>Proxies</key>
            <dict>
                <key>ExceptionsList</key>
                <array>
                    <string>*.local</string>
                    <string>169.254/16</string>
                </array>
                <key>ExcludeSimpleHostnames</key>
                <integer>1</integer>
                <key>FTPPassive</key>
                <integer>1</integer>
                <key>HTTPEnable</key>
                <integer>1</integer>
                <key>HTTPPort</key>
                <integer>8080</integer>
                <key>HTTPProxy</key>
                <string>192.168.171.4</string

I need to write
Code:
<key>ExcludeSimpleHostnames</key>
                <integer>1</integer>

To this section of this file like shown in the first example. There will be a lot more text in the file, but I am only concerned with the sections that are formatted like the one shown in the first example. They will always start with <key>Proxies</key>. There may be multiple <key>Proxies</key> sections, I will need the
Code:
<key>ExcludeSimpleHostnames</key>
                <integer>1</integer>

code inserted into all those sections as shown in the first example.

---------- Post updated at 04:30 PM ---------- Previous update was at 04:23 PM ----------

This is very urgent.. I'm sure it is some use of awk, the simpler the better.. I just need to insert two lines:

<key>ExcludeSimpleHostnames</key>
<integer>1</integer>

to be inserted the next line after </array> I suppose could work.
# 5  
Old 09-30-2009
Code:
INPROXIES=0
CONTAINSKEY=0
CONTAINSARRAYEND=0
while read line
do
    # output the current line
    echo $line >> output
    # test if we're inside <key>Proxies
    if [ $INPROXIES -eq 0 ]
    then
      # set flag only if in current line matches, next 'if' keeps it set
      CONTAINSKEY=`echo $line|grep -c "<key>Proxies</key>"`
    fi

    # test if flag is set
    if [ $CONTAINSKEY -eq 1 ]
    then
        # set flag 
        INPROXIES=1
        CONTAINSARRAYEND=`echo $line|grep -c "<\array>"`
        if [ $CONTAINSARRAYEND -eq 1 ]
        then
          # output new vals
          echo "       <key>ExcludeSimpleHostnames</key>" >> output
          echo "                                  <integer>1</integer>" >> output
          # reset flags
          INPROXIES=0 
          CONTAINSKEY=0
          CONTAINSARRAYEND=0
        fi
    fi
done < infile

this code isn't tested, but it seems like it should do it.
Last edited by varontron; 09-30-2009 at 05:54 PM.. Reason: caveat
# 6  
Old 10-01-2009
glev,

When you say "inserted", is it correct that you mean, "create a new file B with all the lines from A except changing those that I indicated" ? If that's the case, you simply need my second awk script from above. https://www.unix.com/emergency-unix-l...#post302357772
# 7  
Old 10-01-2009
I mean that I need it to check for the lines that I mentioned
<key>ExcludeSimpleHostnames</key>
<integer>1</integer>
In every section that starts with <key>Proxies</key>

and if it doesn't exist there to place it there the line after </array>

I want it to write this info to the file, not to create a new one.
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