This replaces deprecated backticks by more versatile $(...) syntax.

Signed-off-by: Adrian Schmutzler <[email protected]>
---
 package/base-files/files/bin/board_detect        |  2 +-
 .../files/etc/uci-defaults/13_fix-group-user     |  2 +-
 .../files/lib/preinit/30_failsafe_wait           |  2 +-
 package/base-files/files/lib/upgrade/nand.sh     |  8 ++++----
 package/base-files/files/sbin/pkg_check          | 16 ++++++++--------
 5 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/package/base-files/files/bin/board_detect 
b/package/base-files/files/bin/board_detect
index 441db6a08f..840bd0178d 100755
--- a/package/base-files/files/bin/board_detect
+++ b/package/base-files/files/bin/board_detect
@@ -5,7 +5,7 @@ CFG=$1
 [ -n "$CFG" ] || CFG=/etc/board.json
 
 [ -d "/etc/board.d/" -a ! -s "$CFG" ] && {
-       for a in `ls /etc/board.d/*`; do
+       for a in $(ls /etc/board.d/*); do
                [ -x $a ] || continue;
                $(. $a)
        done
diff --git a/package/base-files/files/etc/uci-defaults/13_fix-group-user 
b/package/base-files/files/etc/uci-defaults/13_fix-group-user
index bf9febdfe4..74f501e8f7 100644
--- a/package/base-files/files/etc/uci-defaults/13_fix-group-user
+++ b/package/base-files/files/etc/uci-defaults/13_fix-group-user
@@ -1,6 +1,6 @@
 . /lib/functions.sh
 
-for file in `grep -sl Require-User /usr/lib/opkg/info/*.control`; do
+for file in $(grep -sl Require-User /usr/lib/opkg/info/*.control); do
        file="${file##*/}"
        file="${file%.control}"
        add_group_and_user "${file}"
diff --git a/package/base-files/files/lib/preinit/30_failsafe_wait 
b/package/base-files/files/lib/preinit/30_failsafe_wait
index 85dca398fa..a2c2c386aa 100644
--- a/package/base-files/files/lib/preinit/30_failsafe_wait
+++ b/package/base-files/files/lib/preinit/30_failsafe_wait
@@ -91,7 +91,7 @@ failsafe_wait() {
        grep -q 'failsafe=' /proc/cmdline && FAILSAFE=true && export FAILSAFE
        if [ "$FAILSAFE" != "true" ]; then
                fs_wait_for_key f 'to enter failsafe mode' 
$fs_failsafe_wait_timeout && FAILSAFE=true
-               [ -f "/tmp/failsafe_button" ] && FAILSAFE=true && echo "- 
failsafe button "`cat /tmp/failsafe_button`" was pressed -"
+               [ -f "/tmp/failsafe_button" ] && FAILSAFE=true && echo "- 
failsafe button "$(cat /tmp/failsafe_button)" was pressed -"
                [ "$FAILSAFE" = "true" ] && export FAILSAFE && touch 
/tmp/failsafe
        fi
 }
diff --git a/package/base-files/files/lib/upgrade/nand.sh 
b/package/base-files/files/lib/upgrade/nand.sh
index e7d7bf8d13..3ae06c6199 100644
--- a/package/base-files/files/lib/upgrade/nand.sh
+++ b/package/base-files/files/lib/upgrade/nand.sh
@@ -231,7 +231,7 @@ nand_upgrade_ubinized() {
 
 # Write the UBIFS image to UBI volume
 nand_upgrade_ubifs() {
-       local rootfs_length=`(cat $1 | wc -c) 2> /dev/null`
+       local rootfs_length=$((cat $1 | wc -c) 2> /dev/null)
 
        nand_upgrade_prepare_ubi "$rootfs_length" "ubifs" "0" "0"
 
@@ -249,8 +249,8 @@ nand_upgrade_tar() {
        local board_dir=$(tar tf $tar_file | grep -m 1 '^sysupgrade-.*/$')
        board_dir=${board_dir%/}
 
-       local kernel_length=`(tar xf $tar_file ${board_dir}/kernel -O | wc -c) 
2> /dev/null`
-       local rootfs_length=`(tar xf $tar_file ${board_dir}/root -O | wc -c) 2> 
/dev/null`
+       local kernel_length=$((tar xf $tar_file ${board_dir}/kernel -O | wc -c) 
2> /dev/null)
+       local rootfs_length=$((tar xf $tar_file ${board_dir}/root -O | wc -c) 
2> /dev/null)
 
        local rootfs_type="$(identify_tar "$tar_file" ${board_dir}/root)"
 
@@ -307,7 +307,7 @@ nand_do_upgrade() {
 nand_do_platform_check() {
        local board_name="$1"
        local tar_file="$2"
-       local control_length=`(tar xf $tar_file sysupgrade-$board_name/CONTROL 
-O | wc -c) 2> /dev/null`
+       local control_length=$((tar xf $tar_file sysupgrade-$board_name/CONTROL 
-O | wc -c) 2> /dev/null)
        local file_type="$(identify $2)"
 
        [ "$control_length" = 0 -a "$file_type" != "ubi" -a "$file_type" != 
"ubifs" ] && {
diff --git a/package/base-files/files/sbin/pkg_check 
b/package/base-files/files/sbin/pkg_check
index 9968c9b78e..775e401b26 100755
--- a/package/base-files/files/sbin/pkg_check
+++ b/package/base-files/files/sbin/pkg_check
@@ -72,14 +72,14 @@ while [ "$1" ]; do
        fi
        [ $QUIET = yes ] || echo " * Checking package $1:"
        ERR=""
-       CHECK="`sha256sum -c /usr/lib/opkg/info/$1.files-sha256sum 2> 
/dev/null`"
+       CHECK="$(sha256sum -c /usr/lib/opkg/info/$1.files-sha256sum 2> 
/dev/null)"
 
        # Are the changed files config files?
-       if [ $? -ne 0 ] && [ "`cat "/usr/lib/opkg/info/$1.files-sha256sum"`" ]; 
then
-               NEWCHECK="`echo "$CHECK" | grep '^.*: OK$'`"
-               for i in `echo "$CHECK" | sed -n 's|^\(.*\): FAILED$|\1|p'`; do
-                       if [ "`grep "^$i\$" "/usr/lib/opkg/info/$1.conffiles" 
2> /dev/null`" ] || \
-                          [ "`echo "$i" | grep "^/etc/uci-defaults/"`" ]; then
+       if [ $? -ne 0 ] && [ "$(cat "/usr/lib/opkg/info/$1.files-sha256sum")" 
]; then
+               NEWCHECK="$(echo "$CHECK" | grep '^.*: OK$')"
+               for i in $(echo "$CHECK" | sed -n 's|^\(.*\): FAILED$|\1|p'); do
+                       if [ "$(grep "^$i\$" "/usr/lib/opkg/info/$1.conffiles" 
2> /dev/null)" ] || \
+                          [ "$(echo "$i" | grep "^/etc/uci-defaults/")" ]; then
                                NEWCHECK="${NEWCHECK}${NL}${i}: CONFIGURED"
                        else
                                NEWCHECK="${NEWCHECK}${NL}${i}: FAILED"
@@ -91,7 +91,7 @@ while [ "$1" ]; do
 
        # Do we have changed files or not?
        if [ -z "$ERR" ]; then
-               [ $QUIET = yes ] || [ -z "`cat 
"/usr/lib/opkg/info/$1.files-sha256sum"`" ] || echo "$CHECK" | sed 's|^|   - |'
+               [ $QUIET = yes ] || [ -z "$(cat 
"/usr/lib/opkg/info/$1.files-sha256sum")" ] || echo "$CHECK" | sed 's|^|   - |'
                [ $QUIET = yes ] || echo " * Package $1 is ok"
                [ $QUIET = yes ] || echo
        else
@@ -107,7 +107,7 @@ while [ "$1" ]; do
                        echo "Exiting on first change found!"
                        exit 1
                fi
-               for i in `echo "$CHECK" | sed -n 's|^\(.*\): FAILED$|\1|p'`; do
+               for i in $(echo "$CHECK" | sed -n 's|^\(.*\): FAILED$|\1|p'); do
                        SUMMARY="${SUMMARY}${NL} - $1: $i"
                done
                echo
-- 
2.20.1


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