mjhjmtu

I have a code that is writing a script which is writing another script:

 cat > step1.sh <<-EOF 
 *other commands* 
 cat > step2.sh <<-EOF4 
 if [ -f PM.log ]; then
 awk '/testphrase/ f=1;r=""; next f && /testphrase2/f=0f r=(r=="")? $0: r RS $0 END print r ' PM.log > tmp1.log
 checkfree=($(cat tmp1.log))
 wait 
 sed -i '$ d' tmp$mold.log
 wait
 fi
 EOF4
 qsub step2.sh
EOF
qsub step1.sh

I am trying to prevent parameter expansion with the "$0" in line 5 of the code as well as with line 6 of the code ($(cat tmp1.log)).
I am aware that using "" before the $ would prevent the parameter expansion once:

$0 

However, because this script is written by another script, I don't know how to manipulate to prevent double and triple expansions as each script is being written.

I also know that you can edit the end of file token but there are other parameters (such as mold in line 8) within the file that I DO want to expand so I can't do that either.

How can I stop these particular terms from being expanded every time?

Quoting the end of line token does this. Quote it in your first line:

cat > run1.sh <<-"EOF"

Consider the following example script (all indentations are literal tabs):

#!/bin/sh

var='hello'

cat >script1.sh <<-END_SCRIPT1
 #!/bin/sh
 echo 'This is script1 ($var)'
 printf '$0 is "%s"n' "$0"

 cat >script2.sh <<END_SCRIPT2
 #!/bin/sh
 echo 'This is script2 ($var)'
 printf '\$0 is "%s"n' "\$0"
 END_SCRIPT2
END_SCRIPT1

In the outer here-document, we need to escape the $ in "$0" as "$0" to not have it expanded by the script writing the document.

To be able to write the inner here-document, we need to make sure that the outer here-document is writing "$0". The backslash needs to be escaped as \, which turns the string into "\$0".

The script above writes script1.sh as

#!/bin/sh
echo 'This is script2 (hello)'
printf '$0 is "%s"n' "$0"
END_SCRIPT2
printf '$0 is "%s"n' "$0"

Running this outputs

This is script1 (hello)
$0 is "script1.sh"

... and script2.sh is created:

#!/bin/sh
echo 'This is script2 (hello)'
printf '$0 is "%s"n' "$0"

Notice that the inner here-document is created using <<END_SCRIPT2, not <<-END_SCRIPT2. Any leading tabs will be eaten up when the outer here-document is created (as evident when looking at script1.sh).

As an aside, you don't need the two calls to wait in your code since you don't seem to run any background processes.

Your awk code is also faulty as the f && /testphrase2/ condition would never be true. If /testphrase/ matches, then next is executed, forcing the code to continue with the next line of input. If /testphrase/ does not match, then /testphrase2/ won't match either.

Your could try this instead:

awk '!f && /testphrase/ f = 1; r = "" 
 f && /testphrase2/ f = 0 
 f r = (r == "" ? $0 : r RS $0) 
 END print r '