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files for version 0.7
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‎code_snippets/Builtin_functions.sh‎

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awk 'BEGIN{print length("road"); print length(123456)}'
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printf 'fox\ntiger\n' | awk '{print length()}'
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awk 'length($1) < 6' table.txt
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echo 'αλεπού' | awk '{print length()}'
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echo 'αλεπού' | awk -b '{print length()}'
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awk 'BEGIN{a["z"]=1; a["x"]=12; a["b"]=42; for(i in a) print i, a[i]}'
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awk 'BEGIN{PROCINFO["sorted_in"] = "@ind_str_asc";
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a["z"]=1; a["x"]=12; a["b"]=42; for(i in a) print i, a[i]}'
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awk 'BEGIN{PROCINFO["sorted_in"] = "@val_num_asc";
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a["z"]=1; a["x"]=12; a["b"]=42; for(i in a) print i, a[i]}'
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printf ' one \t two\t\t\tthree ' | awk '{split($0, a); print a[2]}'
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s='Joe,1996-10-25,64,78'
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echo "$s" | awk -F, '{split($2, d, "-"); print $1 " was born in " d[1]}'
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s='air,water,12:42:3'
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echo "$s" | awk -F, '{n=split($NF, a, ":");
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for(i=1; i<=n; i++) print $1,$2,a[i]}'
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s='Sample123string42with777numbers'
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echo "$s" | awk '{split($0, s, /[0-9]+/); print s[2], s[4]}'
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s='Sample123string42with777numbers'
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echo "$s" | awk '{n=split($0, s, /[0-9]+/, seps);
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for(i=1; i<n; i++) print seps[i]}'
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cat marks.txt
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awk 'BEGIN{OFS="\t"; split("DCBAS", g, //)}
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{$(NF+1) = NR==1 ? "Grade" : g[int($NF/10)-4]} 1' marks.txt
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s='eagle,"fox,42",bee,frog'
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echo "$s" | awk '{patsplit($0, a, /"[^"]*"|[^,]*/); print a[2]}'
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echo 'abcdefghij' | awk '{print substr($0, 1, 5)}'
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echo 'abcdefghij' | awk '{print substr($0, 4, 3)}'
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echo 'abcdefghij' | awk '{print substr($0, 6)}'
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echo 'abcdefghij' | awk -v OFS=: '{print substr($0, 2, 3), substr($0, 6, 3)}'
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echo 'abcdefghij' | awk -v FS= '{print $3}'
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echo 'abcdefghij' | awk -v FS= '{print $3, $5}'
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s='051 035 154 12 26 98234'
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echo "$s" | awk 'match($0, /[0-9]{4,}/){print substr($0, RSTART, RLENGTH)}'
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echo "$s" | awk 'match($0, /0*[1-9][0-9]{2,}/, m){print m[0]}'
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echo 'foo=42, baz=314' | awk 'match($0, /baz=([0-9]+)/, m){print m[0]}'
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echo 'foo=42, baz=314' | awk 'match($0, /baz=([0-9]+)/, m){print m[1]}'
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s='42 foo-5, baz3; x-83, y-20: f12'
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echo "$s" | awk '{ while( match($0, /([0-9]+),/, m) ){print m[1];
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$0=substr($0, RSTART+RLENGTH)} }'
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cat eqns.txt
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awk '/i*(t+9-g)/' eqns.txt
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awk 'index($0, "i*(t+9-g)")' eqns.txt
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awk -F, 'index($NF, "a+b")' eqns.txt
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awk -F, '$1=="a+b"' eqns.txt
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awk 'index($0, "a+b")==1' eqns.txt
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awk -v s="a+b" 'index($0, s)==length()-length(s)+1' eqns.txt
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echo 'a\b\c\d' | awk -v s='a\b' 'index($0, s)'
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echo 'a\b\c\d' | awk -v s='a\\b' 'index($0, s)'
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echo 'a\b\c\d' | s='a\b' awk 'index($0, ENVIRON["s"])'
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awk 'BEGIN{system("echo Hello World")}'
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wc table.txt
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awk 'BEGIN{system("wc table.txt")}'
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awk 'BEGIN{system("seq 10 | paste -sd, > out.txt")}'
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cat out.txt
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cat f2.txt
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echo 'f1,f2,f3' | awk -F, '{system("cat " $2 ".txt")}'
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ls xyz.txt
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echo $?
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awk 'BEGIN{s=system("ls xyz.txt"); print "Exit status: " s}'
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awk 'BEGIN{sum = 3.1428 + 10; print sum}'
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awk 'BEGIN{sum = 3.1428 + 100; print sum}'
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awk 'BEGIN{sum = 3.1428 + 10; printf "%f\n", sum}'
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awk 'BEGIN{sum = 3.1428 + 10; printf "%.3f\n", sum}'
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awk 'BEGIN{pi = 3.14159; printf "[%10.3f]\n", pi}'
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awk 'BEGIN{pi = 3.14159; printf "[%-10.3f]\n", pi}'
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awk 'BEGIN{pi = 3.14159; printf "%010.3f\n", pi}'
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awk 'BEGIN{pi = 3.14159; printf "%e\n", pi}'
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awk 'BEGIN{printf "%d\n", 1.99}'
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awk 'BEGIN{printf "%+d\n", 100}'
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awk 'BEGIN{printf "%+d\n", -100}'
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awk 'BEGIN{printf "|%10s|\n", "mango"}'
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awk 'BEGIN{printf "|%-10s|\n", "mango"}'
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awk '{printf "%.4s\n", $0}' table.txt
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awk 'BEGIN{printf "%1$d + %2$d * %1$d = %3$d\n", 3, 4, 15}'
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awk 'BEGIN{printf "hex=%1$#x\noct=%1$#o\ndec=%1$d\n", 15}'
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awk 'BEGIN{d=10; p=3; pi = 3.14159; printf "%0*.*f\n", d, p, pi}'
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awk 'BEGIN{s="solve: 5 % x = 1"; printf s}'
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awk 'BEGIN{s="solve: 5 % x = 1"; printf "%s\n", s}'
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awk 'BEGIN{printf "n%%d gives the remainder\n"}'
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awk 'BEGIN{pi = 3.14159; s = sprintf("%010.3f", pi); print s}'
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seq 6 | awk 'NR%2{print > "odd.txt"; next} {print > "even.txt"}'
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cat odd.txt
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cat even.txt
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awk -v OFS='\t' 'NR>1{print $2, $3 > $1".txt"}' marks.txt
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cat ECE.txt
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awk '{print $2 | "paste -sd,"}' table.txt
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awk '{print $2 | "sort | paste -sd,"}' table.txt
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awk -v OFS='\t' 'NR>1{print $2, $3 | "sort > "$1".txt"}' marks.txt
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cat ECE.txt
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‎code_snippets/Control_Structures.sh‎

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awk '/^b/{print; if($NF>0) print "------"}' table.txt
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awk '/^b/{print; if($NF>0) print "------"; else print "======"}' table.txt
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seq 6 | awk '{ORS = NR%3 ? "-" : RS} 1'
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awk '/^b/{print; print($NF>0 ? "------" : "======")}' table.txt
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awk 'BEGIN{for(i=2; i<7; i+=2) print i}'
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awk -v OFS=, '{for(i=1; i<=NF; i++) if($i ~ /^[bm]/) $i="["$i"]"} 1' table.txt
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cat marks.txt
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awk 'NR>1{d[$1]+=$3; c[$1]++} END{for(k in d) print k, d[k]/c[k]}' marks.txt
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awk -v OFS=, '{for(i=1; i<=NF; i++) if($i ~ /b/){NF=i; break}} 1' table.txt
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awk 'BEGIN{i=6; while(i>0){print i; i-=2}}'
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echo 'titillate' | awk '{while(gsub(/til/, "")) print}'
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awk '/\<par/{print "%% " $0; next} {print /s/ ? "X" : "Y"}' word_anchors.txt
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seq 3542 4623452 | awk 'NR==2452{print; exit}'
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echo $?
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awk '/^br/{print "Invalid input"; exit 1}' table.txt
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echo $?
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awk 'FNR==2{print; exit}' table.txt greeting.txt
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awk 'BEGIN{print "hi"; exit; print "hello"}
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/^b/;
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END{print "bye"}' table.txt
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‎code_snippets/Dealing_with_duplicates.sh‎

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cat purchases.txt
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awk '{print +a[$0] "\t" $0; a[$0]++}' purchases.txt
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awk '!a[$0]++' purchases.txt
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cat duplicates.txt
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awk -F, '!seen[$NF]++' duplicates.txt
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awk -F, '!seen[$1,$3]++' duplicates.txt
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awk -F, '++seen[$2]==2' duplicates.txt
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awk -F, '++seen[$NF]==3' duplicates.txt
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tac duplicates.txt | awk -F, '!seen[$NF]++' | tac
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awk -F, 'NR==FNR{a[$NF]++; next} a[$NF]>1' duplicates.txt duplicates.txt
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awk -F, 'NR==FNR{a[$NF]++; next} a[$NF]>2' duplicates.txt duplicates.txt
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awk -F, 'NR==FNR{a[$3]++; next} a[$3]==1' duplicates.txt duplicates.txt
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‎code_snippets/Field_separators.sh‎

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cat table.txt
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awk '$1 ~ /^b/{print $4}' table.txt
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awk -v f=3 '{print $f}' table.txt
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awk '{print $NF}' table.txt
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awk '{print $(NF-1)}' table.txt
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awk '{print $NF-1}' table.txt
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echo ' a b c ' | awk '{print NF}'
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echo ' a b c ' | awk '{print $1}'
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echo ' a b c ' | awk '{print $NF "."}'
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printf ' one \t two\t\t\tthree ' | awk '{print NF}'
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printf ' one \t two\t\t\tthree ' | awk '{print $2}'
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awk 'BEGIN{printf "%.16f\n", 2.999999999999999}'
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awk 'BEGIN{printf "%.16f\n", 2.9999999999999999}'
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awk '{print $2.999999999999999}' table.txt
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awk '{print $2.9999999999999999}' table.txt
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echo 'goal:amazing:whistle:kwality' | awk -F: '{print $1}'
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echo 'goal:amazing:whistle:kwality' | awk -F: '{print $NF}'
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echo 'one;two;three;four' | awk -F';' '{print $3}'
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echo '=a=b=c=' | awk -F= '{print $1 "," $NF "."}'
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echo 'goal:amazing:whistle:kwality' | awk -v FS=: '{print $2}'
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echo '1e4SPT2k6SPT3a5SPT4z0' | awk 'BEGIN{FS="SPT"} {print $3}'
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echo 'apple' | awk -F '' '{print $1}'
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echo 'apple' | awk -v FS= '{print $NF}'
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echo 'αλεπού' | awk -v FS= '{print $3}'
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echo 'Sample123string42with777numbers' | awk -F'[0-9]+' '{print $2}'
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echo 'Sample123string42with777numbers' | awk -F'[a-zA-Z]+' '{print $2}'
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echo 'load;err_msg--\ant,r2..not' | awk -F'\\W+' '{print $3}'
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echo 'hi.bye.hello' | awk -F. '{print $2}'
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printf 'cool\nnice car\n' | awk -F'[aeiou]' '{print NF-1}'
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echo ' a b c ' | awk -F' ' '{print NF}'
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echo ' a b c ' | awk -F'[ ]' '{print NF}'
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awk '{print $1, $3}' table.txt
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echo 'goal:amazing:whistle:kwality' | awk -F: -v OFS=: '{print $2, $NF}'
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echo 'goal:amazing:whistle:kwality' | awk 'BEGIN{FS=OFS=":"} {print $2, $NF}'
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echo 'goal:amazing:whistle:kwality' | awk -F: -v OFS=- '{print $2, $NF}'
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echo 'goal:amazing:whistle:kwality' | awk -F: -v OFS=: '{$2 = 42} 1'
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echo 'goal:amazing:whistle:kwality' | awk -F: -v OFS=, '{$2 = 42} 1'
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echo ' a b c ' | awk '{$NF = "last"} 1'
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echo 'Sample123string42with777numbers' | awk -F'[0-9]+' -v OFS=, '1'
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echo 'Sample123string42with777numbers' | awk -F'[0-9]+' -v OFS=, '{$1=$1} 1'
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echo 'goal:amazing:whistle:kwality' | awk -F: -v OFS=, '{NF=2} 1'
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echo 'goal:amazing:whistle:kwality' | awk -F: -v OFS=: '{$(NF+1)="sea"} 1'
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echo 'goal:amazing:whistle:kwality' | awk -F: -v OFS=: '{$8="go"} 1'
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echo 'goal:amazing:whistle:kwality' | awk -F: -v OFS=: '{NF=-1} 1'
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s='Sample123string42with777numbers'
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echo "$s" | awk -v FPAT='[0-9]+' '{print $2}'
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echo "$s" | awk -v FPAT='[a-zA-Z]+' -v OFS=, '{$1=$1} 1'
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s='eagle,"fox,42",bee,frog'
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echo "$s" | awk -F, '{print $2}'
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echo "$s" | awk -v FPAT='"[^"]*"|[^,]*' '{print $2}'
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cat items.txt
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awk -v FIELDWIDTHS='8 4 6' '{print $2}' items.txt
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awk -v FIELDWIDTHS='8 4 6' '{print "[" $2 "]"}' items.txt
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awk -v FIELDWIDTHS='5 3:3 1:6' '{print "[" $1 "]"}' items.txt
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awk -v FIELDWIDTHS='5 3:3 1:6' '{print "[" $2 "]"}' items.txt
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awk -v FIELDWIDTHS='5 *' '{print "[" $1 "]"}' items.txt
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awk -v FIELDWIDTHS='5 *' '{print "[" $2 "]"}' items.txt
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