bash で for文やwhile文を1行で書く

3 Replies to “bash で for文やwhile文を1行で書く”

1. SECRET: 0
   PASS: 74be16979710d4c4e7c6647856088456
   本文が英数字のみの場合は書き込めません。

   FILE=$1

   Lines=`wc -l < $FILE`
   CurrentLine=2
   while [ $CurrentLine -lt $Lines ]
   do
   ((CurrentLine++))
   LINE=`tail -$CurrentLine $FILE | head -1`
   j=0
   for i in $LINE
   do
   ((j++))
   if [ $j -eq 3 ]
   then
   echo -n $i" "
   fi
   done
   done
   echo

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2. SECRET: 0
   PASS: 74be16979710d4c4e7c6647856088456
   コメント投稿確認

   #!/bin/bash

   if [ $# -ne 1 -o ! -d "$1" -o ! -r "$1" ]; then
   echo ERROR
   exit 1
   fi

   NFiles=`ls -l $1 | wc -l`
   echo $NFiles

   VAR=`ls -l $1 | tr -s " " | cut -d" " -f5`
   RET=0
   for S in $VAR
   do
   ((RET = $RET + $S))
   done

   echo $RET

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3. SECRET: 0
   PASS: 74be16979710d4c4e7c6647856088456
   ※印は必須項目です。

   #!/bin/bash

   set `cat $1`
   TIMES=$1
   SEC=$2
   OUT=$3
   BAK=$4
   NUM=$5
   ERR=$6

   # flag to tell if mail message has been sent
   MAILSENT=0

   if [ -f $OUT ]
   then
   #if the maximum number of backups already exists,
   #delete the last one to make way for the next run-through
   if [ -f $OUT.$BKPNUM ]
   then
   rm $OUT.$BKPNUM
   fi

   #rename each existing backup file with the next higher numbered extension
   while [ $BAK -ge 1 ]
   do
   NEXT=`expr $BAK + 1`
   mv $OUT.$BAK $OUT.$NEXT 2>$ERR
   ((BAK–))
   done

   #rename the already existing output file with an extension of 1
   mv $OUT $OUT.1 2>>$ERR
   fi

   while [ $TIMES -gt 0 ]
   do
   USERNUM=`who | wc -l` #number of users currently logged in
   DATE=`date`
   #if number of current users >= the max set in the config file, send email
   if [ $USERNUM -ge $NUM -a $MAILSENT -eq 0 ]
   then
   `echo Number of users exceeded: $USERNUM at $DATE | mail $USER`

   echo "Max number of users met. Emailing $USER."
   MAILSENT=1 #change the variable so mail is not sent more than once
   fi
   (echo $DATE Users=$USERNUM) >> $OUT
   ((TIMES–))
   sleep $SEC
   done

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