mjhjmtu

I run a awk script. But, it is here. This is the command awk -f awk_scr ERR.txt.

BEGIN 
FS=" " 
target="missing" 


for (i=1; i <= NR; i++) 
 for(j=1; j <= NF; j++) 
 if ($j == target) 
 do 
 printf $j > "final.txt" 
 while (j == NF)
 
 if (j == NF) 
 printf "n"
 
 

The ERR.txt content is here. This awk script is for trimming what that is matched by "missing" and then print to a file, final.txt.

npm ERR! peer dep missing: react@^15.0.0, required by react-file-reader-input@1.1.4
npm ERR! peer dep missing: jquery@1.9.1 - 3, required by bootstrap@4.2.1
npm ERR! missing: mkdirp@0.5.1, required by node-pre-gyp@0.6.39
npm ERR! missing: rimraf@2.6.1, required by node-pre-gyp@0.6.39
npm ERR! missing: tar@2.2.1, required by node-pre-gyp@0.6.39
npm ERR! missing: hoek@2.16.3, required by hawk@3.1.3
npm ERR! missing: hoek@2.16.3, required by boom@2.10.1
npm ERR! missing: hoek@2.16.3, required by sntp@1.0.9
npm ERR! missing: minimist@0.0.8, required by mkdirp@0.5.1
npm ERR! missing: glob@7.1.2, required by rimraf@2.6.1
npm ERR! missing: fs.realpath@1.0.0, required by glob@7.1.2
npm ERR! missing: inflight@1.0.6, required by glob@7.1.2
npm ERR! missing: inherits@2.0.3, required by glob@7.1.2
npm ERR! missing: minimatch@3.0.4, required by glob@7.1.2
npm ERR! missing: once@1.4.0, required by glob@7.1.2
npm ERR! missing: path-is-absolute@1.0.1, required by glob@7.1.2
npm ERR! missing: once@1.4.0, required by inflight@1.0.6
npm ERR! missing: wrappy@1.0.2, required by inflight@1.0.6
npm ERR! missing: brace-expansion@1.1.7, required by minimatch@3.0.4
npm ERR! missing: balanced-match@0.4.2, required by brace-expansion@1.1.7
npm ERR! missing: concat-map@0.0.1, required by brace-expansion@1.1.7
npm ERR! missing: block-stream@0.0.9, required by tar@2.2.1
npm ERR! missing: fstream@1.0.11, required by tar@2.2.1
npm ERR! missing: inherits@2.0.3, required by tar@2.2.1
npm ERR! missing: inherits@2.0.3, required by block-stream@0.0.9
npm ERR! missing: graceful-fs@4.1.11, required by fstream@1.0.11
npm ERR! missing: inherits@2.0.3, required by fstream@1.0.11
npm ERR! missing: mkdirp@0.5.1, required by fstream@1.0.11
npm ERR! missing: rimraf@2.6.1, required by fstream@1.0.11
npm ERR! missing: fstream@1.0.11, required by tar-pack@3.4.0
npm ERR! missing: once@1.4.0, required by tar-pack@3.4.0
npm ERR! missing: rimraf@2.6.1, required by tar-pack@3.4.0
npm ERR! missing: tar@2.2.1, required by tar-pack@3.4.0
npm ERR! missing: fstream@1.0.11, required by fstream-ignore@1.0.5
npm ERR! missing: inherits@2.0.3, required by fstream-ignore@1.0.5
npm ERR! missing: minimatch@3.0.4, required by fstream-ignore@1.0.5
npm ERR! missing: wrappy@1.0.2, required by once@1.4.0
npm ERR! missing: inherits@2.0.3, required by readable-stream@2.2.9

But, when I execute the command, there is only a blank stdout.

================ADD MORE CONTENT================

This is what I expect to be, albeit I just spend few minutes to do. Anyway, the awk script is worth to use in the future.

 missing: react@^15.0.0, required by react-file-reader-input@1.1.4
 missing: jquery@1.9.1 - 3, required by bootstrap@4.2.1
 missing: mkdirp@0.5.1, required by node-pre-gyp@0.6.39
 missing: rimraf@2.6.1, required by node-pre-gyp@0.6.39
 missing: tar@2.2.1, required by node-pre-gyp@0.6.39
 missing: hoek@2.16.3, required by hawk@3.1.3
 missing: hoek@2.16.3, required by boom@2.10.1
 missing: hoek@2.16.3, required by sntp@1.0.9
 missing: minimist@0.0.8, required by mkdirp@0.5.1
 missing: glob@7.1.2, required by rimraf@2.6.1
 missing: fs.realpath@1.0.0, required by glob@7.1.2
 missing: inflight@1.0.6, required by glob@7.1.2
 missing: inherits@2.0.3, required by glob@7.1.2
 missing: minimatch@3.0.4, required by glob@7.1.2
 missing: once@1.4.0, required by glob@7.1.2
 missing: path-is-absolute@1.0.1, required by glob@7.1.2
 missing: once@1.4.0, required by inflight@1.0.6
 missing: wrappy@1.0.2, required by inflight@1.0.6
 missing: brace-expansion@1.1.7, required by minimatch@3.0.4
 missing: balanced-match@0.4.2, required by brace-expansion@1.1.7
 missing: concat-map@0.0.1, required by brace-expansion@1.1.7
 missing: block-stream@0.0.9, required by tar@2.2.1
 missing: fstream@1.0.11, required by tar@2.2.1
 missing: inherits@2.0.3, required by tar@2.2.1
 missing: inherits@2.0.3, required by block-stream@0.0.9
 missing: graceful-fs@4.1.11, required by fstream@1.0.11
 missing: inherits@2.0.3, required by fstream@1.0.11
 missing: mkdirp@0.5.1, required by fstream@1.0.11
 missing: rimraf@2.6.1, required by fstream@1.0.11
 missing: fstream@1.0.11, required by tar-pack@3.4.0
 missing: once@1.4.0, required by tar-pack@3.4.0
 missing: rimraf@2.6.1, required by tar-pack@3.4.0
 missing: tar@2.2.1, required by tar-pack@3.4.0
 missing: fstream@1.0.11, required by fstream-ignore@1.0.5
 missing: inherits@2.0.3, required by fstream-ignore@1.0.5
 missing: minimatch@3.0.4, required by fstream-ignore@1.0.5
 missing: wrappy@1.0.2, required by once@1.4.0
 missing: inherits@2.0.3, required by readable-stream@2.2.9

# awk_scr

BEGIN 
 # clear the output file if it already exists
 # you can do this using your shell instead
 ORS = ""
 print "" > "final.txt"
 ORS = "n"


/missing/ 
 # delete all characters prior to the last occurrence of "missing:"
 # this assumes that there is only one sub-string "missing:" per line
 sub(/.*missing:/, "missing:", $0)

 # append the updated line to the output file
 print $0 >> "final.txt"

Then run awk -f awk_scr ERR.txt && cat final.txt.

Another solution is to use sed, which is shorter:

sed 's/^.*missing:/missing:/' ERR.txt | tee final.txt

However, it has the same downside as the awk solution: it assumes that there is only one occurrence of "missing:" per line. This is due to the fact that both awk and sed only match greedily.

To simulate lazy matching, you can do the following, instead (which is better):

sed -E 's/(missing)(.*)|./12/g' ERR.txt | tee final.txt

I believe your script is a bit convoluted and shows a misunderstanding of what 'awk' is all about. Awk programs consist out of a list of

pattern actions 

statement. Every time a new record/line is read, awk will process that line by executing the pattern-action statement one by one. From what I see, it looks like you imagine that awk reads the full file in memory and you can then process it using a for loop over the number of records. This is not how it works.

The following awk will probably do what you request:

awk '/missing/' inputfile > "missing.txt"

Here, the patter is /missing/ and the action is the default action 1 which is equal to print $0, or print the full record. The pattern /missing/ states, select all lines which contain the substring "missing"