How to Remove Space/Tab from Command Output

How to remove space/TAB from command output

awk '/^MemTotal:/ {print $2}' /proc/meminfo

Output (e.g.), unit: kB:

3095532

Or:

grep -oP "^MemTotal: *\K[^ ]+" /proc/meminfo

Output (e.g.), unit: kB:

3095532

Remove blank spaces comm output

Given this input and comm output:

$ cat file1
YAL002W
YAL003W
YAL008W

$ cat file2
YAL004W
YAL005C
YAL008W
YAL011W

$ comm file1 file2
YAL002W
YAL003W
        YAL004W
        YAL005C
                YAL008W
        YAL011W

This will do what you asked for:

$ cat tst.awk
BEGIN { FS=OFS="\t" }
{
    colNr = NF
    rowNr = ++rowNrs[colNr]
    val[rowNr,colNr] = $NF
    numCols = (colNr > numCols ? colNr : numCols)
    numRows = (rowNr > numRows ? rowNr : numRows)
}
END {
    for (rowNr=1; rowNr<=numRows; rowNr++) {
        for (colNr=1; colNr<=numCols; colNr++) {
            printf "%s%s", val[rowNr,colNr], (colNr<numCols ? OFS : ORS)
        }
    }
}

.

$ comm file1 file2 | awk -f tst.awk
YAL002W YAL004W YAL008W
YAL003W YAL005C
        YAL011W

but of course you could just skip the call to comm and use awk right off the bat:

$ cat tst.awk
BEGIN { FS=OFS="\t" }
NR==FNR {
    file1[$0]
    next
}
{
    if ($0 in file1) {
        colNr = 3
        delete file1[$0]
    }
    else {
        colNr = 2
    }
    rowNr = ++rowNrs[colNr]
    val[rowNr,colNr] = $0
}
END {
    for (v in file1) {
        colNr = 1
        rowNr = ++rowNrs[colNr]
        val[rowNr,colNr] = v
    }

    numRows = (rowNrs[1] > rowNrs[2] ? rowNrs[1] : rowNrs[2])
    numRows = (numRows   > rowNrs[3] ? numRows   : rowNrs[3])
    numCols = 3
    for (rowNr=1; rowNr<=numRows; rowNr++) {
        for (colNr=1; colNr<=numCols; colNr++) {
            printf "%s%s", val[rowNr,colNr], (colNr<numCols ? OFS : ORS)
        }
    }
}

.

$ awk -f tst.awk file1 file2
YAL002W YAL004W YAL008W
YAL003W YAL005C
        YAL011W

Bash - How to remove all white spaces from a given text file?

$ man tr
NAME
    tr - translate or delete characters

SYNOPSIS
    tr [OPTION]... SET1 [SET2]

DESCRIPTION
   Translate, squeeze, and/or delete characters from standard 
   input, writing to standard output.

In order to wipe all whitespace including newlines you can try:

cat file.txt | tr -d " \t\n\r" 

You can also use the character classes defined by tr (credits to htompkins comment):

cat file.txt | tr -d "[:space:]"

For example, in order to wipe just horizontal white space:

cat file.txt | tr -d "[:blank:]"

How to remove space from string?

Try doing this in a shell:

var="  3918912k"
echo ${var//[[:blank:]]/}

That uses parameter expansion (it's a non posix feature)

[[:blank:]] is a POSIX regex class (remove spaces, tabs...), see http://www.regular-expressions.info/posixbrackets.html

Get rid of spaces and tabs in wmic output

The output from WMIC is unicode, your "spaces" are nulls from the two bytes unicode characters in file. Try with

wmic logicaldisk get caption,description,volumename | find /v "" >>"C:\out.log"

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