Modified version check script for LFS to make output a bit easier to read. WIP.

lfs-version-check-enhanced

#!/bin/bash
## Simple script to list version numbers of critical development tools
## Original by LFS team / contributor(s), modified by Phate6660.

## Startup
export LC_ALL=C

## Aliases
bash_version="$(bash --version | head -n1 | cut -d" " -f2-4)"
binutils_version="$(ld --version | head -n1 | cut -d" " -f3-)"
bison_version="$(bison --version | head -n1)"
bzip2_version="$(bzip2 --version 2>&1 < /dev/null | head -n1 | cut -d" " -f1,6-)"
coreutils_version="$(chown --version | head -n1 | cut -d")" -f2)"
diff_version="$(diff --version | head -n1)"
find_version="$(find --version | head -n1)"
gawk_version="$(gawk --version | head -n1)"
gcc_version="$(gcc --version | head -n1)"
gccplusplus_version="$(g++ --version | head -n1)"
glibc_version="$(ldd --version | head -n1 | cut -d" " -f2-)"
grep_version="$(grep --version | head -n1)"
gzip_version="$(gzip --version | head -n1)"
system_info="$(cat /proc/version)"
m4_version="$(m4 --version | head -n1)"
make_version="$(make --version | head -n1)"
patch_version="$(patch --version | head -n1)"
perl_version="$(perl -V:version)"
python_version="$(python3 --version)"
sed_version="$(sed --version | head -n1)"
tar_version="$(tar --version | head -n1)"
makeinfo_version="$(makeinfo --version | head -n1)"
xz_version="$(xz --version | head -n1)"

## Functions
shell_version() {
    MYSH=$(readlink -f /bin/sh)
    if echo $MYSH | grep -q bash; then
		shell_version="/bin/sh -> $MYSH"
	else
		shell_version="ERROR: /bin/sh does not point to bash, please fix that."
	fi
    unset MYSH
}

yacc_version() {
    if [ -h /usr/bin/yacc ]; then
        yacc_version="/usr/bin/yacc -> $(readlink -f /usr/bin/yacc)"
    elif [ -x /usr/bin/yacc ]; then
        yacc_version="$(/usr/bin/yacc --version | head -n1)"
    else
        yacc_version="Not installed or not found." 
    fi
}

awk_version() {
    if [ -h /usr/bin/awk ]; then
        awk_version="/usr/bin/awk -> $(readlink -f /usr/bin/awk)";
    elif [ -x /usr/bin/awk ]; then
        awk_version="$(/usr/bin/awk --version | head -n1)"
    else 
        awk_version="awk not found"
    fi
}

gccplusplus_complilation_test() {
    echo 'int main(){}' > dummy.c && g++ -o dummy dummy.c
    if [ -x dummy ]; then
		gccplusplus_complilation_test="g++ compilation OK"
    else
		gccplusplus_complilation_test="g++ compilation failed"
	fi
    rm -f dummy.c dummy
}

main() {
    echo "
awk                   =  $awk_version
bash                  =  $bash_version       
binutils              =  $binutils_version   
bison                 =  $bison_version      
bzip2                 =  $bzip2_version      
coreutils             =  $coreutils_version  
diff                  =  $diff_version       
find                  =  $find_version       
gawk                  =  $gawk_version       
gcc                   =  $gcc_version        
g++                   =  $gccplusplus_version
g++ compilation test  =  $gccplusplus_complilation_test
glibc                 =  $glibc_version      
grep                  =  $grep_version       
gzip                  =  $gzip_version       
system info           =  $system_info        
m4                    =  $m4_version         
make                  =  $make_version       
patch                 =  $patch_version      
perl                  =  $perl_version       
python                =  $python_version     
sed                   =  $sed_version        
shell                 =  $shell_version
tar                   =  $tar_version        
makeinfo              =  $makeinfo_version   
xz                    =  $xz_version         
yacc                  =  $yacc_version
"
}

## Run
awk_version
gccplusplus_complilation_test
shell_version
yacc_version
main

Example output:

awk                   =  /usr/bin/awk -> /usr/bin/gawk
bash                  =  bash, version 4.4.23(1)-release       
binutils              =  (Gentoo 2.33.1 p2) 2.33.1   
bison                 =  bison (GNU Bison) 3.1      
bzip2                 =  bzip2,  Version 1.0.6, 6-Sept-2010.      
coreutils             =   8.31  
diff                  =  diff (GNU diffutils) 3.6       
find                  =  find (GNU findutils) 4.7.0       
gawk                  =  GNU Awk 4.2.1, API: 2.0       
gcc                   =  gcc (Gentoo 9.3.0 p2) 9.3.0        
g++                   =  g++ (Gentoo 9.3.0 p2) 9.3.0
g++ compilation test  =  g++ compilation OK
glibc                 =  (Gentoo 2.29-r7 p8) 2.29      
grep                  =  grep (GNU grep) 3.3       
gzip                  =  gzip 1.9       
system info           =  Linux version 5.4.31-ck-valley (root@gentoo) (gcc version 9.2.0 (Gentoo 9.2.0-r2 p3)) #1 SMP PREEMPT Mon Apr 20 06:39:08 EDT 2020        
m4                    =  m4 (GNU M4) 1.4.18         
make                  =  GNU Make 4.2.1       
patch                 =  GNU patch 2.7.6      
perl                  =  version='5.30.1';       
python                =  Python 3.6.10     
sed                   =  sed (GNU sed) 4.7        
shell                 =  /bin/sh -> /bin/bash
tar                   =  tar (GNU tar) 1.32        
makeinfo              =  texi2any (GNU texinfo) 6.6   
xz                    =  xz (XZ Utils) 5.2.4         
yacc                  =  /usr/bin/yacc -> /usr/bin/yacc.bison