Increment input Variable Number in shell Script

Question

I have a lot script in which it is reading the input parameter. I need to increment all the input parameter by 1. So in case if it 1 it need to be 2 & 2 need to 3 etc. Is there any unix command which can replace this in one go for all scripts instead of going to each scripts and doing it manually. I am new to Unix not sure if there is any way to do it. Below is the example. Appreciate any help on this.

Before Changes

#!/bin/ksh
hv_bus_date="CAST('$1' AS DATE FORMAT 'YYYYMMDD')"
hv_octs_sys_wid=$2
hv_act_id=$3

After Changes

#!/bin/ksh
hv_bus_date="CAST('$2' AS DATE FORMAT 'YYYYMMDD')"
hv_octs_sys_wid=$3
hv_act_id=$4

Is it possible for those scripts to take more than 9 positional parameters? — oguz ismail
– oguz ismail, Commented Dec 8, 2019 at 12:15
Then I'd go with something like printf 's/\$%d/$%d/g\n' {1,{2..8}{,},9} | tac | sed -i -f - file1 file2 .... Don't try this without backuping inputs though, it's not really reliable — oguz ismail
– oguz ismail, Commented Dec 8, 2019 at 12:36
Hi Oguz, I tried using this on multiple files..it is working. Thanks for your reply. — Ramesh S
– Ramesh S, Commented Dec 8, 2019 at 14:45

RavinderSingh13 · Accepted Answer · 2019-12-08 15:00:02Z

2

EDIT: To save output into Input_file(s) itself without a GNU awk try following(but make sure you run my 1st solution to see if output is looking correct).

Let's say we have scripts whose values we need to change.

-rw-rw-r-- 1 ubuntu ubuntu  83 Dec  8 14:34 file2.ksh
-rw-rw-r-- 1 ubuntu ubuntu  83 Dec  8 14:34 file1.ksh

Our awk script's name is script.ksh to make sure this script is NOT coming under its own radar :)

cat script.ksh
awk '
FNR==1{
  close(out)
  out="out"++count
  rename=(rename?rename ORS:"") "mv " out OFS FILENAME
}
match($0,/\$[0-9]+/){
  before=substr($0,1,RSTART)
  value=substr($0,RSTART+1,RLENGTH)
  rest=substr($0,RSTART+RLENGTH)
  if(value<9){
    value++
  }
  print before value rest > (out)
}
END{
  if(rename){
    system(rename)
  }
}
' file*sh

Now when we run the above script by doing ./script.ksh and we can one of the file named file1.ksh see its contents have been changed now as follows.

BEFORE:

cat file1.ksh
hv_bus_date="CAST('$1' AS DATE FORMAT 'YYYYMMDD')"
hv_octs_sys_wid=$2
hv_act_id=$3

AFTER:

cat file1.ksh
hv_bus_date="CAST('$2' AS DATE FORMAT 'YYYYMMDD')"
hv_octs_sys_wid=$3
hv_act_id=$4

1st solution: Could you please try following, considering that your script names are ending with .sh extensions and this will NOT save output into Input_file(s), it will print output on terminal only for you to check output if its coming fine.

awk '
match($0,/\$[0-9]+/){
  before=substr($0,1,RSTART)
  value=substr($0,RSTART+1,RLENGTH)
  rest=substr($0,RSTART+RLENGTH)
  if(value<9){
    value++
  }
  print before value rest
}
' *sh

2nd solution(With only newer versions of GNU awk): Once you are happy with results of above command and if you have gawk command then try following, this should save output into Input_file(s) itself. IMHO this needs gawk 4.1.0 + version.

awk -i inplace -v INPLACE_SUFFIX=.bak '
match($0,/\$[0-9]+/){
  before=substr($0,1,RSTART)
  value=substr($0,RSTART+1,RLENGTH)
  rest=substr($0,RSTART+RLENGTH)
  if(value<9){
    value++
  }
  print before value rest
}
' *sh

edited Dec 8, 2019 at 15:00

answered Dec 8, 2019 at 12:46

RavinderSingh13

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2 Comments

Ramesh S Over a year ago

Hi Ravinder, I tried it by putting the correct file, now it is working..thanks a lot for your prompt response.

RavinderSingh13 Over a year ago

@RameshS, btw thanks for asking this question, I too will make a note of this EDIT program since it does it without GNU awk too, cheers.

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