Command Line Exercises - Revision history

Rf at 17:44, 12 April 2017

2017-04-12T17:44:36Z

2017-04-12T17:29:27Z

2017-04-12T16:58:03Z

2017-04-12T16:56:10Z

2017-04-12T16:55:26Z

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 == Get to know our target file ==
-Our target file is a tab-separated list of data rows, with quite a few columns. We're only interested in some of these columns, and we need to find what the column numbers are. We go inside one of the subfoldes and use a combination of head and cat (with its numbering option to see the number-label correspondance better:
+Our target file is a tab-separated list of data rows, with quite a few columns. We're only interested in some of these columns, and we need to find what the column numbers are. We go inside one of the subfoldes and use a combination of head and cat (with its numbering option) to see the number-label correspondance better:
-  head -1 target.tsv |tr "\t" "\n"
+  head -1 target.tsv |tr "\t" "\n" |cat -n
 = for-loop over the subfolders =

@@ Line 5: / Line 5: @@
 In each of these examples we show the finished one-liner first, and then proceed to build it up
-= Extract columns from files held in differenrt subfolders =
+= Extract columns from files held in different subfolders =
 We shall run a for-loop in the shell environment and execute an awk column-selecting command for a certain file called '''report.tsv'''
 == Finished Command ==
-  for i in $(ls -d */); do S=$(echo ${i%/*}); export S; \
+  for i in ls -d */; do S=$(echo ${i%/*}); export S; \
      awk '{if(NR!=1){if($19 != ".") {system("./echon.sh $S"); printf "\t%s\t%s\t%s\t%s\t%s\n",$2,$15,$17,$19,$20}}}' \
      ${i}report.tsv;echo; \
   done >a.xls
 = for-loop over the subfolders =

@@ Line 11: / Line 11: @@
 == Finished Command ==
-  for i in $(ls -d */); do S=$(echo ${i%/*}); export S; awk '{if(NR!=1){if($19 != ".") {system("./echon.sh $S"); printf "\t%s\t%s\t%s\t%s\t%s\n",$2,$15,$17,$19,$20}}}' ${i}report.tsv;echo;done >a.xls
+  for i in $(ls -d */); do S=$(echo ${i%/*}); export S; \
 = for-loop over the subfolders =

← Older revision	Revision as of 16:56, 12 April 2017
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	+	= Command-line Exercises =

	+	Many of these are so called throwaway one-liners
	+
	+	In each of these examples we show the finished one-liner first, and then proceed to build it up
	+
	+	= Extract columns from files held in differenrt subfolders =
	+
	+	We shall run a for-loop in the shell environment and execute an awk column-selecting command for a certain file called '''report.tsv'''
	+
	+
	+	== Finished Command ==
	+	for i in $(ls -d /); do S=$(echo ${i%/}); export S; awk '{if(NR!=1){if($19 != ".") {system("./echon.sh $S"); printf "\t%s\t%s\t%s\t%s\t%s\n",$2,$15,$17,$19,$20}}}' ${i}report.tsv;echo;done >a.xls
	+
	+	= for-loop over the subfolders =