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Minors changes, ';' 'sh to bash'

  #!/bin/bash
    #  acctchk.sh 
    #  This script compares the current /etc/passwd file against an archived copy called /root/passed.ar.  #  It produces a list of added or deleted accounts.  It creates an archived file from /etc/passwd 
    #  called /root/passwd.ar if none exists.
    cd  /root
    if [ -f  /root/passwd.ar ]; then
      echo “Today is `date`”       # print today’s date
      sort </etc/passwd > ./tmp1     # sort the contents of the /etc/passwd file into tmp1
      sort </root/passwd.ar> ./tmp2  # sort the contents of the /root/passwd.ar file into tmp2
      echo “*** Accounts added:”
      comm -23 ./tmp1 ./tmp2    # output any lines that are in tmp1 but not in tmp2 (added accounts)
      echo “*** Accounts deleted:”
      comm -13 ./tmp1 ./tmp2  # output any lines that are in tmp2 but not in tmp1 (deleted accounts)
      echo “”
      rm –f ./tmp1 ./tmp2  # remove temporary files
    else
      echo “** Creating archived /etc/passwd file ** “
      cp /etc/passwd  /root/passwd.ar  #  create the archive if it doesn’t already exist
    fi

Minors changes, ';' 'then;' other 'sh to bash'

  #!/bin/bash
    #  acctchk.sh 
    #  This script compares the current /etc/passwd file against an archived copy called /root/passed.ar.  #  It produces a list of added or deleted accounts.  It creates an archived file from /etc/passwd 
    #  called /root/passwd.ar if none exists.
    cd  /root
    if [ -f  /root/passwd.ar ]; then
      echo “Today is `date`”       # print today’s date
      sort </etc/passwd > ./tmp1     # sort the contents of the /etc/passwd file into tmp1
      sort </root/passwd.ar> ./tmp2  # sort the contents of the /root/passwd.ar file into tmp2
      echo “*** Accounts added:”
      comm -23 ./tmp1 ./tmp2    # output any lines that are in tmp1 but not in tmp2 (added accounts)
      echo “*** Accounts deleted:”
      comm -13 ./tmp1 ./tmp2  # output any lines that are in tmp2 but not in tmp1 (deleted accounts)
      echo “”
      rm –f ./tmp1 ./tmp2  # remove temporary files
    else
      echo “** Creating archived /etc/passwd file ** “
      cp /etc/passwd  /root/passwd.ar  #  create the archive if it doesn’t already exist
    fi

Minors changes, 'then;' other 'sh to bash'bash' I share you a great guide about conditionals (if statements).

  #!/bin/bash
    #  acctchk.sh 
    #  This script compares the current /etc/passwd file against an archived copy called /root/passed.ar.  #  It produces a list of added or deleted accounts.  It creates an archived file from /etc/passwd 
    #  called /root/passwd.ar if none exists.
    cd  /root
    if [ -f  /root/passwd.ar ]; then
      echo “Today is `date`”       # print today’s date
      sort </etc/passwd > ./tmp1     # sort the contents of the /etc/passwd file into tmp1
      sort </root/passwd.ar> ./tmp2  # sort the contents of the /root/passwd.ar file into tmp2
      echo “*** Accounts added:”
      comm -23 ./tmp1 ./tmp2    # output any lines that are in tmp1 but not in tmp2 (added accounts)
      echo “*** Accounts deleted:”
      comm -13 ./tmp1 ./tmp2  # output any lines that are in tmp2 but not in tmp1 (deleted accounts)
      echo “”
      rm –f ./tmp1 ./tmp2  # remove temporary files
    else
      echo “** Creating archived /etc/passwd file ** “
      cp /etc/passwd  /root/passwd.ar  #  create the archive if it doesn’t already exist
    fi

Minors changes, 'then;' '; then' other 'sh to bash' I share you a great guide about conditionals (if statements).

  #!/bin/bash
    #  acctchk.sh 
    #  This script compares the current /etc/passwd file against an archived copy called /root/passed.ar.  #  It produces a list of added or deleted accounts.  It creates an archived file from /etc/passwd 
    #  called /root/passwd.ar if none exists.
    cd  /root
    if [ -f  /root/passwd.ar ]; then
      echo “Today is `date`”       # print today’s date
      sort </etc/passwd > ./tmp1     # sort the contents of the /etc/passwd file into tmp1
      sort </root/passwd.ar> ./tmp2  # sort the contents of the /root/passwd.ar file into tmp2
      echo “*** Accounts added:”
      comm -23 ./tmp1 ./tmp2    # output any lines that are in tmp1 but not in tmp2 (added accounts)
      echo “*** Accounts deleted:”
      comm -13 ./tmp1 ./tmp2  # output any lines that are in tmp2 but not in tmp1 (deleted accounts)
      echo “”
      rm –f ./tmp1 ./tmp2  # remove temporary files
    else
      echo “** Creating archived /etc/passwd file ** “
      cp /etc/passwd  /root/passwd.ar  #  create the archive if it doesn’t already exist
    fi