add shell solutions

Author: limbowandering

solution/0192.Word Frequency/Solution.sh

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+#!/usr/bin/env bash
+
+# NF是当前行的field字段数；NR是正在处理的当前行数。
+awk '{
+  for(i=1;i<=NF;i++){
+    res[$i]++
+  }
+}
+END{
+  for(k in res){
+    print k,res[k]
+  }
+}' words.txt | sort -nr -k2
+
+#or:
+
+cat words.txt | tr -s ' ' '\n' | sort | uniq -c | sort -r | awk '{print $2" "$1}'

solution/0193.Valid Phone Numbers/Solution.sh

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+#!/usr/bin/env bash
+
+# -P : --perl-regexp
+grep -P '^(\d{3}-|\(\d{3}\) )\d{3}-\d{4}$' file.txt
+
+# or use sed
+sed -n -E '/^([0-9]{3}-|\([0-9]{3}\) )[0-9]{3}-[0-9]{4}$/p' file.txt
+
+# or use awk
+awk '/^([0-9]{3}-|\([0-9]{3}\) )[0-9]{3}-[0-9]{4}$/' file.txt

solution/0194.Transpose File/Solution.sh

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+#!/usr/bin/env bash
+
+awk '
+{
+  for (i=1; i<=NF; i++) {
+    if(NR == 1) {
+      res[i] = re$i
+    } else {
+      res[i] = res[i]" "$i
+    }
+  }
+}END {
+  for (i=1;i<=NF;i++) {
+    print res[i]
+  }
+}
+' file.txt

solution/0195.Tenth Line/Solution.sh

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+#!/usr/bin/env bash
+
+# tail -n: use -n +K to output starting with the Kth
+tail -n +10 file.txt | head -1
+
+# awk: 
+awk 'NR == 10' file.txt
+
+# sed:
+sed -n 10p file.txt