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Editorial Team
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Asked: 2026-05-27T04:24:58+00:00

I have a BASH/shell script, running on Linux, but it sometimes has a problem

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I have a BASH/shell script, running on Linux, but it sometimes has a problem getting the drive labels, using blkid.. blkid gets the drive labels nad UUIDs of the given drive.

Example of blkid output:

# blkid /dev/sda1
/dev/sda1: LABEL="Home" UUID="f1e5e82b-1c75-4fd7-8841-6ad766152dcf" TYPE="ext2"

The problem occurs when the drive label has a newline character… I have included the relevant function. The problem seems to be with the eval command.. Can someone help me?

blkid_name_generator() {
   #Gather blkid output and filter out required device
   if [ ! -f /tmp/blkid.txt ]; then
      blkid -c /dev/null > /tmp/blkid.txt
   fi
   blkid_cleaner &
   LABEL=""
   LABEL1=""
   eval $( cat /tmp/blkid.txt | grep "$@:" | cut --delimiter=" " -f 2- | sed -e 's/ /;/g')
   LABEL1=${LABEL//;/ } # akita beta4 fix: remove newlines below
   LABEL=`echo $LABEL1 | tr -d '\n'` # akita beta5 fix, remove newlines from drive label
   #Generate drive label
   [ "$LABEL" = "" ] && ONEDRVLABEL="$@\n \n " || ONEDRVLABEL="${LABEL}\n($@)\n "
   echo "${LABEL}" and "${ONEDRVLABEL}"
} 

blkid_name_generator /dev/sda1
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1 Answer

  1. Editorial Team

    Here’s my bash snippet:

    while read curline; do
  if [[ ${curline:0:1} == "/" ]]; then
    [[ $prevline ]] && echo "$prevline"
    prevline="$curline"
  else
    prevline+="$curline"
  fi
done < $INPUTFILE

[[ $prevline ]] && echo "$prevline"

    Here’s my test file:

    /dev/sda1: LABEL="Boot" UUID="fdc5e51d-3da6-4edf-bf07-6397b1765797" TYPE="ext2"
/dev/sda2: LABEL="Root" UUID="f883df24-1b93-46fb-8990-840774c380c4" TYPE="ext4"
/dev/sda3: LABEL="Usr" UUID="ba759de3-e0e4-4603-a324-f11dc25fa784" TYPE="reiserfs"
/dev/sdb1: LABEL="Persis
tents" UUID="50b81ef0-a38b-4677-b9d9-9548b29ce2bb" TYPE="ext4"
/dev/sdc1: LABEL="Tempo
raries" UUID="a649c535-1a8a-4b2b-b0a0-4afbdc60a3bc" TYPE="reiserfs"
/dev/sdd1: LABEL="Usr
Portage" UUID="a228148e-6405-4bbe-990f-df6eaebb1b1d" TYPE="reiserfs"
/dev/sda1: LABEL="Boot" UUID="fdc5e51d-3da6-4edf-bf07-6397b1765797" TYPE="ext2"
/dev/sda2: LABEL="Root" UUID="f883df24-1b93-46fb-8990-840774c380c4" TYPE="ext4"

    Here’s my test file after processed by the bash snippet:

    /dev/sda1: LABEL="Boot" UUID="fdc5e51d-3da6-4edf-bf07-6397b1765797" TYPE="ext2"
/dev/sda2: LABEL="Root" UUID="f883df24-1b93-46fb-8990-840774c380c4" TYPE="ext4"
/dev/sda3: LABEL="Usr" UUID="ba759de3-e0e4-4603-a324-f11dc25fa784" TYPE="reiserfs"
/dev/sdb1: LABEL="Persistents" UUID="50b81ef0-a38b-4677-b9d9-9548b29ce2bb" TYPE="ext4"
/dev/sdc1: LABEL="Temporaries" UUID="a649c535-1a8a-4b2b-b0a0-4afbdc60a3bc" TYPE="reiserfs"
/dev/sdd1: LABEL="UsrPortage" UUID="a228148e-6405-4bbe-990f-df6eaebb1b1d" TYPE="reiserfs"
/dev/sda1: LABEL="Boot" UUID="fdc5e51d-3da6-4edf-bf07-6397b1765797" TYPE="ext2"
/dev/sda2: LABEL="Root" UUID="f883df24-1b93-46fb-8990-840774c380c4" TYPE="ext4"

    Hope this helps!

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