Fix shellcheck-identified warnings in shell scripts

Author: a1346054

test/appveyor-build.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 machine=$(uname -m)
-mkdir build-$machine
-cd build-$machine
+mkdir "build-$machine"
+cd "build-$machine"
 meson ..
 ninja

test/travis-build.sh

@@ -13,8 +13,8 @@ TEST_CMD="python3 -m pytest --maxfail=99 test/"
 
 # Standard build with Valgrind
 for CC in gcc clang; do
-    mkdir build-${CC}; cd build-${CC}
-    if [ ${CC} == 'gcc-6' ]; then
+    mkdir "build-${CC}"; cd "build-${CC}"
+    if [ "${CC}" == 'gcc-6' ]; then
         build_opts='-D b_lundef=false'
     else
         build_opts=''
@@ -25,12 +25,12 @@ for CC in gcc clang; do
     TEST_WITH_VALGRIND=true ${TEST_CMD}
     cd ..
 done
-(cd build-$CC; sudo ninja install)
+(cd "build-${CC}"; sudo ninja install)
 
 # Sanitized build
 CC=clang
 for san in undefined address; do
-    mkdir build-${san}; cd build-${san}
+    mkdir "build-${san}"; cd "build-${san}"
     # b_lundef=false is required to work around clang
     # bug, cf. https://groups.google.com/forum/#!topic/mesonbuild/tgEdAXIIdC4
     meson -D b_sanitize=${san} -D b_lundef=false -D werror=true ..

test/travis-install.sh

@@ -13,7 +13,7 @@ ninja
 sudo ninja install
 test -e /usr/local/lib/pkgconfig || sudo mkdir /usr/local/lib/pkgconfig
 sudo mv /usr/local/lib/*/pkgconfig/* /usr/local/lib/pkgconfig/
-ls -d1 /usr/local/lib/*-linux-gnu | sudo tee /etc/ld.so.conf.d/usrlocal.conf
+printf '%s\n' /usr/local/lib/*-linux-gnu | sudo tee /etc/ld.so.conf.d/usrlocal.conf
 sudo ldconfig
 
 # Setup ssh